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imagecreatefromjpeg — Erzeugt ein neues Bild im JPEG-Format, welches aus einer Datei oder von einer URL gelesen wird
ImageCreateFromJPEG() gibt den Bezeichner auf ein Bild zurück, der das aus der angegebenen Datei eingelesene Bild darstellt.
Im Fehlerfall gibt ImageCreateFromJPEG() eine leere Zeichenkette zurück. Zudem wird eine Fehlermeldung erzeugt, die im Browser als Verbindungsabbruch dargestellt wird. Zum besseren Debuggen wird das folgende Beispiel einen JPEG-Fehler erzeugen:
Beispiel #1 Beispiel, um die Handhabung eines Fehlers bei der Bilderzeugung zu sehen (Dank an vic@zymsys.com):
function LoadJpeg ($imgname) {
$im = @ImageCreateFromJPEG ($imgname); /* Versuch, Datei zu öffnen */
if (!$im) { /* Prüfen, ob fehlgeschlagen */
$im = ImageCreate (150, 30); /* Erzeugen eines leeren Bildes */
$bgc = ImageColorAllocate ($im, 255, 255, 255);
$tc = ImageColorAllocate ($im, 0, 0, 0);
ImageFilledRectangle ($im, 0, 0, 150, 30, $bgc);
/* Ausgabe einer Fehlermeldung */
ImageString($im, 1, 5, 5, "Fehler beim Öffnen von: $imgname", $tc);
}
return $im;
}
If you get the dreaded "Fatal error: Call to undefined function imagecreatefromjpeg()" message, check that your GD library is working properly by to looking at the output of phpinfo().
You need to check explicitly for JPEG support in the output (gd section), otherwise the imagecreatefromjpeg function won't work.
There is my actual script to resize image without distortion to generate a thumbnail and/or show a smaller to browser.
<?php
// usual header used on my all pages
ob_start("ob_gzhandler");
$PHP_SELF=$_SERVER['PHP_SELF'];
include "include/errors.php"; //error log script
// actual script begins here
$type=false;
function open_image ($file) {
//detect type and process accordinally
global $type;
$size=getimagesize($file);
switch($size["mime"]){
case "image/jpeg":
$im = imagecreatefromjpeg($file); //jpeg file
break;
case "image/gif":
$im = imagecreatefromgif($file); //gif file
break;
case "image/png":
$im = imagecreatefrompng($file); //png file
break;
default:
$im=false;
break;
}
return $im;
}
$url = $_GET['url'];
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && (strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == filemtime($url))) {
// send the last mod time of the file back
header('Last-Modified: '.gmdate('D, d M Y H:i:s', filemtime($url)).' GMT', true, 304); //is it cached?
} else {
$image = open_image($url);
if ($image === false) { die ('Unable to open image'); }
$w = imagesx($image);
$h = imagesy($image);
//calculate new image dimensions (preserve aspect)
if(isset($_GET['w']) && !isset($_GET['h'])){
$new_w=$_GET['w'];
$new_h=$new_w * ($h/$w);
} elseif (isset($_GET['h']) && !isset($_GET['w'])) {
$new_h=$_GET['h'];
$new_w=$new_h * ($w/$h);
} else {
$new_w=isset($_GET['w'])?$_GET['w']:560;
$new_h=isset($_GET['h'])?$_GET['h']:560;
if(($w/$h) > ($new_w/$new_h)){
$new_h=$new_w*($h/$w);
} else {
$new_w=$new_h*($w/$h);
}
}
$im2 = ImageCreateTrueColor($new_w, $new_h);
imagecopyResampled ($im2, $image, 0, 0, 0, 0, $new_w, $new_h, $w, $h);
//effects
if(isset($_GET['blur'])){
$lv=$_GET['blur'];
for($i=0; $i<$lv;$i++){
$matrix=array(array(1,1,1),array(1,1,1),array(1,1,1));
$divisor = 9;
$offset = 0;
imageconvolution($im2, $matrix, $divisor, $offset);
}
}
if(isset($_GET['sharpen'])){
$lv=$_GET['sharpen'];
for($i=0; $i<$lv;$i++){
$matrix = array(array(-1,-1,-1),array(-1,16,-1),array(-1,-1,-1));
$divisor = 8;
$offset = 0;
imageconvolution($im2, $matrix, $divisor, $offset);
}
}
header('Content-type: image/jpeg');
$name=explode(".", basename($_GET['url']));
header("Content-Disposition: inline; filename=".$name[0]."_t.jpg");
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', filemtime($url)) . ' GMT');
header("Cache-Control: public");
header("Pragma: public");
imagejpeg($im2);
//imagedestroy($im2);
//imagedestroy($image);
}
?>
If you have a blank in the file name, and you use a local URL, this function works. Not so with a fully qualified URL
<?php
$url = 'RAY_rgb 300x100.jpg';
$img = ImageCreateFromJPEG($url);
// WORKS PERFECTLY
$url = 'http://www.example.com/RAY_rgb 300x100.jpg';
$img = ImageCreateFromJPEG($url);
// FAILS Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg: JPEG library reports unrecoverable error
?>
I encountered a problem with this function on a windows system. Instead of returning false in case of the file not being a JPG, the function resulted in an error:
"imagecreatefromjpeg() : gd-jpeg : JPEG library reports unrecoverable error".
To get around this first check whether the file is a JPEG file using its mime type, if it is not return false.
Last night I posted the following note under move_upload_file and looked tonight to see if it got into the system. I happen to also pull up imagecreatefromjpeg and got reminded of many resize scripts in this section. Unfortunately, my experience was not covered by most of the examples below because each of them assumed less than obvious requirements of the server and browser. So here is the post again under this section to help others uncover the mystery in file uploading and resizing arbitrary sized images. I have been testing for several days with hundreds of various size images and it seems to work well. Many additional features could be added such as transparency, alpha blending, camera specific knowledge, more error checking. Best of luck.
--- from move_upload_file post ---
I have for a couple of years been stymed to understand how to effectively load images (of more than 2MB) and then create thumbnails. My note below on general file uploading was an early hint of some of the system default limitations and I have recently discovered the final limit I offer this as an example of the various missing pieces of information to successfully load images of more than 2MB and then create thumbnails. This particular example assumes a picture of a user is being uploaded and because of browser caching needs a unique number at the end to make the browser load a new picture for review at the time of upload. The overall calling program I am using is a Flex based application which calls this php file to upload user thumbnails.
The secret sauce is:
1. adjust server memory size, file upload size, and post size
2. convert image to standard formate (in this case jpg) and scale
The server may be adjusted with the .htaccess file or inline code. This example has an .htaccess file with file upload size and post size and then inline code for dynamic system memory.
htaccess file:
php_value post_max_size 16M
php_value upload_max_filesize 6M
<?php
// $img_base = base directory structure for thumbnail images
// $w_dst = maximum width of thumbnail
// $h_dst = maximum height of thumbnail
// $n_img = new thumbnail name
// $o_img = old thumbnail name
function convertPic($img_base, $w_dst, $h_dst, $n_img, $o_img)
{ini_set('memory_limit', '100M'); // handle large images
unlink($img_base.$n_img); // remove old images if present
unlink($img_base.$o_img);
$new_img = $img_base.$n_img;
$file_src = $img_base."img.jpg"; // temporary safe image storage
unlink($file_src);
move_uploaded_file($_FILES['Filedata']['tmp_name'], $file_src);
list($w_src, $h_src, $type) = getimagesize($file_src); // create new dimensions, keeping aspect ratio
$ratio = $w_src/$h_src;
if ($w_dst/$h_dst > $ratio) {$w_dst = floor($h_dst*$ratio);} else {$h_dst = floor($w_dst/$ratio);}
switch ($type)
{case 1: // gif -> jpg
$img_src = imagecreatefromgif($file_src);
break;
case 2: // jpeg -> jpg
$img_src = imagecreatefromjpeg($file_src);
break;
case 3: // png -> jpg
$img_src = imagecreatefrompng($file_src);
break;
}
$img_dst = imagecreatetruecolor($w_dst, $h_dst); // resample
imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $w_dst, $h_dst, $w_src, $h_src);
imagejpeg($img_dst, $new_img); // save new image
unlink($file_src); // clean up image storage
imagedestroy($img_src);
imagedestroy($img_dst);
}
$p_id = (Integer) $_POST[uid];
$ver = (Integer) $_POST[ver];
$delver = (Integer) $_POST[delver];
convertPic("your/file/structure/", 150, 150, "u".$p_id."v".$ver.".jpg", "u".$p_id."v".$delver.".jpg");
?>
As of PHP 5.1.3, if you are dealing with corrupted JPEG images you should set the 'gd.jpeg_ignore_warning' directive to 1 to ignore warnings that could mess up your code.
In runtime, you should do this:
<?php
ini_set('gd.jpeg_ignore_warning', 1);
?>
Regards,
Paulo Ricardo
I didn't find any example like this, so I mixed pieces together.. hope this will save time to other people!
Here's a complete solution to READ any image (gif jpg png) from the FILESYSTEM, SCALE it to a max width/height, SAVE the scaled image to a BLOB field keeping the original image type. Quite tricky..
<?php
function scaleImageFileToBlob($file) {
$source_pic = $file;
$max_width = 200;
$max_height = 200;
list($width, $height, $image_type) = getimagesize($file);
switch ($image_type)
{
case 1: $src = imagecreatefromgif($file); break;
case 2: $src = imagecreatefromjpeg($file); break;
case 3: $src = imagecreatefrompng($file); break;
default: return ''; break;
}
$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;
if( ($width <= $max_width) && ($height <= $max_height) ){
$tn_width = $width;
$tn_height = $height;
}elseif (($x_ratio * $height) < $max_height){
$tn_height = ceil($x_ratio * $height);
$tn_width = $max_width;
}else{
$tn_width = ceil($y_ratio * $width);
$tn_height = $max_height;
}
$tmp = imagecreatetruecolor($tn_width,$tn_height);
/* Check if this image is PNG or GIF to preserve its transparency */
if(($image_type == 1) OR ($image_type==3))
{
imagealphablending($tmp, false);
imagesavealpha($tmp,true);
$transparent = imagecolorallocatealpha($tmp, 255, 255, 255, 127);
imagefilledrectangle($tmp, 0, 0, $tn_width, $tn_height, $transparent);
}
imagecopyresampled($tmp,$src,0,0,0,0,$tn_width, $tn_height,$width,$height);
/*
* imageXXX() has only two options, save as a file, or send to the browser.
* It does not provide you the oppurtunity to manipulate the final GIF/JPG/PNG file stream
* So I start the output buffering, use imageXXX() to output the data stream to the browser,
* get the contents of the stream, and use clean to silently discard the buffered contents.
*/
ob_start();
switch ($image_type)
{
case 1: imagegif($tmp); break;
case 2: imagejpeg($tmp, NULL, 100); break; // best quality
case 3: imagepng($tmp, NULL, 0); break; // no compression
default: echo ''; break;
}
$final_image = ob_get_contents();
ob_end_clean();
return $final_image;
}
?>
So, let's suppose you have a form where a user can upload an image, and you have to scale it and save it into your database.
<?php
[..] // the user has clicked the Submit button..
// Check if the user entered an image
if ($_FILES['imagefile']['name'] != '') {
$image = scaleImageFileToBlob($_FILES['imagefile']['tmp_name']);
if ($image == '') {
echo 'Image type not supported';
} else {
$image_type = $_FILES['imagefile']['type'];
$image = addslashes($image);
$query = "UPDATE yourtable SET image_type='$image_type', image='$image' WHERE ...";
$result = mysql_query($query);
if ($result) {
echo 'Image scaled and uploaded';
} else {
echo 'Error running the query';
}
}
}
?>
I found that:
imagecreatefromJPEG is for .JPEG and .JPG ending
&
imagecreatefromjpeg is for .jpeg and .jpg ending.
That function is case sensitive.
This code will allow you to resize any image (jpg, gif or png). It will even work with alpha transparency on pngs. It will limit both dimensions so that neither is higher than requested $thumb_width and preserve aspect ratio as well.
I searched for a very long time before finding this, I have made a few personal changes such as those listed above.
Credit goes to "vandai" on www.akemapa.com.
<?php
function resize($img, $thumb_width, $newfilename)
{
$max_width=$thumb_width;
//Check if GD extension is loaded
if (!extension_loaded('gd') && !extension_loaded('gd2'))
{
trigger_error("GD is not loaded", E_USER_WARNING);
return false;
}
//Get Image size info
list($width_orig, $height_orig, $image_type) = getimagesize($img);
switch ($image_type)
{
case 1: $im = imagecreatefromgif($img); break;
case 2: $im = imagecreatefromjpeg($img); break;
case 3: $im = imagecreatefrompng($img); break;
default: trigger_error('Unsupported filetype!', E_USER_WARNING); break;
}
/*** calculate the aspect ratio ***/
$aspect_ratio = (float) $height_orig / $width_orig;
/*** calulate the thumbnail width based on the height ***/
$thumb_height = round($thumb_width * $aspect_ratio);
while($thumb_height>$max_width)
{
$thumb_width-=10;
$thumb_height = round($thumb_width * $aspect_ratio);
}
$newImg = imagecreatetruecolor($thumb_width, $thumb_height);
/* Check if this image is PNG or GIF, then set if Transparent*/
if(($image_type == 1) OR ($image_type==3))
{
imagealphablending($newImg, false);
imagesavealpha($newImg,true);
$transparent = imagecolorallocatealpha($newImg, 255, 255, 255, 127);
imagefilledrectangle($newImg, 0, 0, $thumb_width, $thumb_height, $transparent);
}
imagecopyresampled($newImg, $im, 0, 0, 0, 0, $thumb_width, $thumb_height, $width_orig, $height_orig);
//Generate the file, and rename it to $newfilename
switch ($image_type)
{
case 1: imagegif($newImg,$newfilename); break;
case 2: imagejpeg($newImg,$newfilename); break;
case 3: imagepng($newImg,$newfilename); break;
default: trigger_error('Failed resize image!', E_USER_WARNING); break;
}
return $newfilename;
}
echo resize("test4.png", 120, "thumb_test4.png")
?>
Make a mental note, if it looks like your routine is crashing non-stop, double check to make sure you didn't spell the function like so...
imagecreatefromjpg (should be jpeg)
I spent an entire night overlooking this one small detail. I love how php won't crash out with an error saying the function doesn't exist, but then again, that could be my host.
http://www.justuspics.com
For a script that allows you to calculate the "fudge factor" discussed below by Karolis and Yaroukh, try the following. Grab a few images, preferably some large ones (the script should cope with images of up to 10 megapixels or so), some small ones, and some ones in between. Add their filenames to the $images array, then load the script in your browser.
<?php
header('Content-Type: text/plain');
ini_set('memory_limit', '50M');
function format_size($size) {
if ($size < 1024) {
return $size . ' bytes';
}
else {
$size = round($size / 1024, 2);
$suffix = 'KB';
if ($size >= 1024) {
$size = round($size / 1024, 2);
$suffix = 'MB';
}
return $size . ' ' . $suffix;
}
}
$start_mem = memory_get_usage();
echo <<<INTRO
The memory required to load an image using imagecreatefromjpeg() is a function
of the image's dimensions and the images's bit depth, multipled by an overhead.
It can calculated from this formula:
Num bytes = Width * Height * Bytes per pixel * Overhead fudge factor
Where Bytes per pixel = Bit depth/8, or Bits per channel * Num channels / 8.
This script calculates the Overhead fudge factor by loading images of
various sizes.
INTRO;
echo "\n\n";
echo 'Limit: ' . ini_get('memory_limit') . "\n";
echo 'Usage before: ' . format_size($start_mem) . "\n";
// Place the images to load in the following array:
$images = array('image1.jpg', 'image2.jpg', 'image3.jpg');
$ffs = array();
echo "\n";
foreach ($images as $image) {
$info = getimagesize($image);
printf('Loading image %s, size %s * %s, bpp %s... ',
$image, $info[0], $info[1], $info['bits']);
$im = imagecreatefromjpeg($image);
$mem = memory_get_usage();
echo 'done' . "\n";
echo 'Memory usage: ' . format_size($mem) . "\n";
echo 'Difference: ' . format_size($mem - $start_mem) . "\n";
$ff = (($mem - $start_mem) /
($info[0] * $info[1] * ($info['bits'] / 8) * $info['channels']));
$ffs[] = $ff;
echo 'Difference / (Width * Height * Bytes per pixel): ' . $ff . "\n";
imagedestroy($im);
$start_mem = memory_get_usage();
echo 'Destroyed. Memory usage: ' . format_size($start_mem) . "\n";
echo "\n";
}
echo 'Mean fudge factor: ' . (array_sum($ffs) / count($ffs));
?>
// a function for resize the images(png,jpg,gif) in a directory
//for the png you must have the zlib actived
//$diror origin directory
//$dirdest destination directory
//$val value of resize(1,2,3..)
//$qual quality(80 if you don't know)
function imgres($diror,$dirdest,$val,$qual){
$q=$qual;
//open the directory
if (is_dir($diror)) {
if ($dh = opendir($diror)) {
while (($file = readdir($dh)) !== false) {
if($file == "." || $file == ".."){continue;}
$k=explode(".",$file);
if(strpos($k[1],"jpg")===0 || strpos($k[1],"jpeg")===0){
$salva=$dirdest.$file;
$image=$diror.$file;
$im =imagecreatefromjpeg("$image");
$x=imagesx($im);
$y=imagesy($im);
$thumbnail=imagecreatetruecolor($x/$val,$y/$val);
$im_ridimensionata=imagecopyresized( $thumbnail, $im, 0, 0, 0, 0, $x/$val,
$y/$val, $x, $y);
imagejpeg($thumbnail, $salva, $q);
}
elseif(strpos($k[1],"gif")===0){
$salva=$dirdest.$file;
$image=$diror.$file;
$im =imagecreatefromgif("$image");
$x=imagesx($im);
$y=imagesy($im);
$thumbnail=imagecreatetruecolor($x/$val,$y/$val);
$im_ridimensionata=imagecopyresized( $thumbnail, $im, 0, 0, 0, 0, $x/$val,
$y/$val, $x, $y);
imagegif($thumbnail, $salva, $q);
}
elseif(strpos($k[1],"png")===0){
$salva=$dirdest.$file;
$image=$diror.$file;
$im =imagecreatefrompng("$image");
$x=imagesx($im);
$y=imagesy($im);
$thumbnail=imagecreatetruecolor($x/$val,$y/$val);
$im_ridimensionata=imagecopyresized( $thumbnail, $im, 0, 0, 0, 0, $x/$val,
$y/$val, $x, $y);
imagepng($thumbnail, $salva, $q);
}
else{
echo "File not compatible(no jpg,gif or png)";
}
}
closedir($dh);
}
}
}
Tips for Windows User to Set up GD(dynamic graphic lib) with PHP.
Problem I meet:
When i run following function, which terminates at
$img = @imagecreatefromjpeg($image_path);
error message is : undefined function imagecreatefromjpeg();
no other code of the script gets executed.
Solution:
In one word, you need to turn on gd lib,
which hold the implementation of imagecreatefromjpeg();
please follow below steps:
my php install dir is: c:/php/
first you must try to find:
c:/php/php.ini
c:/php/ext/php_gd2.dll(php 5)
c:/php/extension/php_gd2.dll(php 4)
The php_gd2.dll is included in a standard PHP installation for Windows,
however, it's not enabled by default.
You have to turn it on,
You may simply uncomment the line "extension=php_gd2.dll" in php.ini and restart the PHP extension.
Change:
,extension=php_gd2.dll
To:
extension=php_gd2.dll
You may also have to correct the extension directory setting
from:
extension_dir = "./"
extension_dir = "./extensions"
To (FOR WINDOWS):
extension_dir = "c:/php/extensions"(php 4)
extension_dir = "c:/php/ext"(php 5)
Cheers!
I've found a bug in CentOS 4.x that, while previously addressed, does not seem to be directly addressed here as far as the nature of the bug is concerned.
If you are having a problem getting this function to work on CentOS 4.4 (may appear earlier) and are receiving this error:
Call to undefined function imagecreatefromjpeg()
This is because the installation *does* support JPG by default if you have libjpeg installed. However, the config script finds libjpeg in /usr/lib but it is never successfully added to the PHP build.
To fix this, you should recompile PHP and be absolutely sure to add '--with-jpeg-dir' to the config command. This should appear BEFORE the --with-gd option. Example:
'--with-jpeg-dir' '--with-gd'
If you don't put it before --with-gd, the option is completely ignored.
As always, be sure to do a 'make clean' before a 'make install'. I made the mistake of forgetting to check and wasted 30 minutes trying to resolve this problem simply because I forgot to clean up after myself previously.
If imagecreatefromjpeg() fails with "PHP Fatal error: Call to undefined function: imagecreatefromjpeg()", it does NOT necessarily mean that you don't have GD installed.
If phpinfo() shows GD, but not JPEG support, then that's the problem. You would think that --with-gd would do the right thing since it does check for the existance of libjpeg (and finds it) and add that feature to GD, but it doesn't in v4.4.4 at least on RHEL v2.1, RHEL v3, CentOS v2.1 or CentOS v4.3.
On those platforms, it's *important* that --with-jpeg-dir be *before* --with-gd. If it's not, GD won't build with jpeg support as if --with-jpeg-dir had never been specified...
In a post by Angel Leon, an example script was given that forms a thumbnail gallery using imagecreatefromjpeg. I am fairly new to php scripts, but I found that the script did not display the table of thumbnail images if the row wasn't "filled" with images.. i.e. if there were 5 images in the folder and the script specified 3 rows in the table, then the page would only display the thumbnails for the first row and only three images were shown. I found that if you specified the variable row with this equation, then the table would display properly:
$row = intval(count($files)+($row_size-1));
(This is the first line in the createThumbTable function.)
script for nokia photos which end with FF D9 and still imagecreatefromjpeg() returns error.
<?php
error_reporting( 32 );
header( 'Content-Type: image/jpeg' );
$imgPath = 'att.jpg';
// Atdod atpakaļ GD_ImageResource
function imageCreateFromJpegEx($file)
{
$data = file_get_contents($file);
$im = @imagecreatefromstring($data);
$i = 0;
while (!$im)
{
$data = substr_replace($data, "", -3, -2);
$im = @imagecreatefromstring($data);
}
return $im;
}
$im = imageCreateFromJpegEx($imgPath);
imagejpeg( $im );
?>
script by Delfins in latvian php forums
regarding e dot a dot schultz at gmail dot com post
i tried the script (with the bugfixes posted later) and still got memorytrouble. most often it is still not enough memory to upload big images, even if it seems to calculate right. so this helped my perfectly:
$newLimit = $newLimit+3000000; (before passing it to the ini_set() function).
extremly simple and maybe not the best solution, but it works for now (you sure can give it less than an additional 3mb, just try what works for you).
It is worth noting that all of the imagecreate* functions quite intentionally do not look in the include_path
When working with uploaded jpeg files it is usually a good idea to execute a little but very useful program called jhead
( http://www.sentex.net/~mwandel/jhead/ ).
This will clean up unnecessary jpeg header information which can cause trouble. Some cameras or applications write binary data into the headers which may result in ugly results such as strange colors when you resample the image later on.
Usage:
<?php
exec("/path/to/jhead -purejpg /path/to/image");
// for example when you uploaded a file through a form, do this before you proceed:
exec("/path/to/jhead -purejpg ".$file['tmp_name']);
?>
I didn't have the chance to test this but I guess this might even solve the problem caused by images that were taken with Canon PowerShot cameras which crash PHP.
This is from the jhead documentation: "-purejpg: Delete all JPEG sections that aren't necessary for rendering the image. Strips any metadata that various applications may have left in the image."
jhead got some other useful options as well...
The prior script by "e dot a dot schultz at gmail dot com", have a bug
$memoryLimitMB don't have a value
Add
$memoryLimitMB = 8;
Before
$memoryLimit = 8 * $MB;
And change that line for:
$memoryLimit = $memoryLimitMB * $MB;
--------------
Something similar happens with the script by "JohnBrook at pobox dot com"
$memoryLimit don't have a value
Change:
$memoryLimit = $memoryLimit * $MB;
For:
$memoryLimit = $memoryLimitMB * $MB;
In John's human readable code version of Karolis code to dynimicly allocate need memory there are a few bugs. If you didn't compile with the "--enable-memory-limit" option, this script will error with a level E_ERROR. Bellow is a fixed version rapped as a function. To view replacement functions for memory_get_usage() look at http://us2.php.net/manual/en/function.memory-get-usage.php
<?php
function setMemoryForImage( $filename ){
$imageInfo = getimagesize($filename);
$MB = 1048576; // number of bytes in 1M
$K64 = 65536; // number of bytes in 64K
$TWEAKFACTOR = 1.5; // Or whatever works for you
$memoryNeeded = round( ( $imageInfo[0] * $imageInfo[1]
* $imageInfo['bits']
* $imageInfo['channels'] / 8
+ $K64
) * $TWEAKFACTOR
);
//ini_get('memory_limit') only works if compiled with "--enable-memory-limit" also
//Default memory limit is 8MB so well stick with that.
//To find out what yours is, view your php.ini file.
$memoryLimit = 8 * $MB;
if (function_exists('memory_get_usage') &&
memory_get_usage() + $memoryNeeded > $memoryLimit)
{
$newLimit = $memoryLimitMB + ceil( ( memory_get_usage()
+ $memoryNeeded
- $memoryLimit
) / $MB
);
ini_set( 'memory_limit', $newLimit . 'M' );
return true;
}else
return false;
}
}
?>
Matt reported that PHP crashs using imagecreatefromjpeg() - that's true and it took me a lot of time to find the error - but not only the Canon PowerShot S70, also the Canon PowerShot A400 lets PHP (5.1.2) crash, without any chance to catch it!
So I exclude all Canon PowerShot images with the following check:
function check_canonpowershot($filename)
{
if (strpos(file_get_contents($filename), 'Canon PowerShot') !== false)
{
return true;
}
return false;
}
Also, here is the same formula presented in a somewhat more human-readable way, if you'd rather:
<?php
$MB = Pow(1024,2); // number of bytes in 1M
$K64 = Pow(2,16); // number of bytes in 64K
$TWEAKFACTOR = 1.8; // Or whatever works for you
$memoryNeeded = round( ( $imageInfo[0] * $imageInfo[1]
* $imageInfo['bits']
* $imageInfo['channels'] / 8
+ $K64
) * $TWEAKFACTOR
);
$memoryHave = memory_get_usage();
$memoryLimitMB = (integer) ini_get('memory_limit');
$memoryLimit = $memoryLimit * $MB;
if ( function_exists('memory_get_usage')
&& $memoryHave + $memoryNeeded > $memoryLimit
) {
$newLimit = $memoryLimitMB + ceil( ( $memoryHave
+ $memoryNeeded
- $memoryLimit
) / $MB
);
ini_set( 'memory_limit', $newLimit . 'M' );
}
?>
Additional note on allocating memory: The 1.65 in the formula provided below by yaroukh and Karolis is evidently a "fudge factor" arrived at through experimentation. I found that I had to nudge it up a little bit in order to accurately predict the memory that would be needed, otherwise the allocation still failed. In my case, I went right to 1.8 and that has worked so far. Your mileage may vary, so experiment as needed.
Hello Karolis
My solution was intended to solve situations when your webhoster puts a limit on the memory usage; in such a situations ini_set doesn't work ofcourse (even for variables that have 'PHP_INI_ALL' flag in a typical PHP-installation).
Have a nice day
Yaroukh
In addition to yaroukh at gmail dot com comment.
It seems that even a small image can eat up your default memory limit real quick. Config value 'memory_limit' is marked PHP_INI_ALL, so you can change it dynamically using ini_set. Therefore, we can "allocate memory dynamically", to prevent those memory limit exceeded errors.
<?php
$imageInfo = getimagesize('PATH/TO/YOUR/IMAGE');
$memoryNeeded = round(($imageInfo[0] * $imageInfo[1] * $imageInfo['bits'] * $imageInfo['channels'] / 8 + Pow(2, 16)) * 1.65);
if (function_exists('memory_get_usage') && memory_get_usage() + $memoryNeeded > (integer) ini_get('memory_limit') * pow(1024, 2)) {
ini_set('memory_limit', (integer) ini_get('memory_limit') + ceil(((memory_get_usage() + $memoryNeeded) - (integer) ini_get('memory_limit') * pow(1024, 2)) / pow(1024, 2)) . 'M');
}
?>
In running 4.3. Found out that jpegs generated by Canon PowerShot S70's cause imagecreatefromjpeg() to crash PHP [page cannot be displayed]. Made this function to check for it:
<?php
function check_s70($filename) {
$thereturn = false;
$handle = fopen($filename, "r");
$contents = fread($handle, 159);
fclose($handle);
if (substr($contents, 156, 3) == "S70") {
$thereturn = true;
}
return $thereturn;
}
?>
Estimated memory needed for ImageCreateFromJPEG
First I supposed simple width*height*bpp will be enough, it isn't though; there is some pretty big overhead.
$imageInfo = GetImageSize($imageFilename);
$memoryNeeded = Round(($imageInfo[0] * $imageInfo[1] * $imageInfo['bits'] * $imageInfo['channels'] / 8 + Pow(2, 16)) * 1.65);
With memory_limit enabled running out of memory causes script to crash; above written will tel you how much memory you're gonna need for creating an image-resource out of image-file. So in conjunction with Memory_Get_Usage() and Get_CFG_Var('memory_limit') you can avoid the mentioned ending. (Yet there won't be too many images blocked from processing that would still fit in the memory, as the results of this are pretty accurate.)
If you get this error: "Warning: imagecreatefromjpeg(): gd-jpeg: JPEG library reports unrecoverable error" then check the JPEG files. If they are saved in CMYK format (instead of RGB) then GD will fail to load them (tested with GD 2.0.12)
here is a code, inspired by the button of
tl at comvironment dot com
but here, you can make as many buttons as you need by cutting the image in as many parts as defined in the table
<?php
class Button_Array{
var $tab_button = array();// the text of each button you want to create
var $im;//the image file
function Button_Array($fileName, $tab_string){
$this -> tab_button = $tab_string;
$this -> im = $fileName;
//parameters
$font = 10;
//cut the full image in X parts
//X = the number of buttons you want
$imgFull=ImageCreateFromJPEG($this -> im);
list($width, $heightFull, $type, $attr) = getimagesize($this -> im);
$height = round($heightFull/sizeof($this->tab_button),0);
for ($i=0;$i<sizeof($this->tab_button);$i++ ) {
$pos=$i*$height;
$imgParts[$i]=ImageCreateTrueColor($width,$height);
if(imagecopy($imgParts[$i],$imgFull,0,0,0,$pos,$width,$height)){
//manips
$textColor = imagecolorallocate ($imgParts[$i],0,20,90);
ImageString ($imgParts[$i],$font,200,10,$this->tab_button[$i],$textColor);
//création du fichier
ImageJPEG($imgParts[$i] , $this->tab_button[$i].'.jpg',85);
}
}
}
}
$tab[]="topic1";
$tab[]="topic2";
$tab[]="topic3";
$tab[]="topic4";
$tab[]="more topics";
$tabButton=new Button_Array("a.jpg",$tab);
echo "<table border=0 cellspacing=0 cellpadding=0>";
foreach ($tab as $source) {
echo "<tr><td><img src='$source.jpg'></td></tr>";
}
echo "</table>";
?>
the check_jpeg function listed above has a small "bug" when u set $fix=true... after the fix, the function does not close the file... and the imagecreatefromjpeg would still crash on an open file.
//# [070203]
//# check for jpeg file header and footer - also try to fix it
function check_jpeg($f, $fix=false ){
if ( false !== (@$fd = fopen($f, 'r+b' )) ){
if (fread($fd,2)==chr(255).chr(216) ){
fseek ( $fd, -2, SEEK_END );
if ( fread($fd,2)==chr(255).chr(217) ){
fclose($fd);
return true;
}else{
if ($fix && fwrite($fd,chr(255).chr(217)) ){
fclose($fd);
return true;
}
fclose($fd);
return false;
}
} else {
fclose($fd);
return false;
}
} else {
return false;
}
}
I am using PHP 4.3.8 and GD 2.0.23-compatible, and this function does not return an empty string on failure as stated. This line:
<?php
var_dump(imagecreatefromjpeg('bogus filename'));
?>
outputs:
bool(false)
Of course this doesn't matter unless you're using a strict comparison operator to evaluate the result, but I thought I'd point it out.
Under some configurations imagecreatefromjpeg will create files that are owned by the webserver rather than the php user. For example, php may be run as phpuser and the image will be created under apache.
This can lead to permissions problems - only a +0777 will be enough to be able to create a picture.
My solution was to chmod over ftp to 0777 just before the picture is written then change back to 0755 when the image has been created.
The alternative of course would be to have a properly configured system...
This is a very useful script when you have hundreds of images and you need a quick setup for a thumbnail, where you can select how many
pictures per row, size of the thumbnail, and the size of the pictures when clicked, all in one script. Just throw all your images and this script in a file named index.php or index.html (if your apache httpd.conf defaults to html and runs .html as php).
Script also contains simple text watermarking. See function thumbImage()
and modify to add image watermarking if you like.
<?
// 30 Minutes Thumbnail script written by Angel Leon from wedoit4you.com
// Licensed under the GPL
// Courtesy of wedoit4you.com
//Instructions:
//copy this script wherever you have a bunch of .jpgs
// Invoke your thumbnail like this http://mysite.com/imageFolder/index.php
//where index.php is this script.
//Modify and redistribute but don't remove our trademark.
//configure script here
//pictures per row
$row_size = 3;
//height of the pictures in thumbnail
$thumb_height = 200;
//height of the pictures when clicked (to save bandwidth)
$big_image_height=668;
//short name of your site
$waterMark = "mysite.com";
$dh = opendir(".");
$files = array();
while (($file = readdir($dh)) !== false) {
if (ereg("jpg",$file) || ereg("gif",$file) || ereg("png",$file)) {
$files[] = $file;
}
}
closedir($dh);
if ($show_image) {
thumbImage($show_image,$big_image_height,$waterMark);
} else if ($thumb_image) {
thumbImage($thumb_image,$thumb_height,$waterMark);
}
else {
echo "<center>" . createThumbTable($files,$row_size) . "</center>";
}
function createThumbTable($files,$pics_wide) {
$row = intval(count($files)/$pics_wide);
$picIndex = 0;
$rs = "Mostrando " . count($files) . " imagenes<br>";
$rs .= "<table border=0 cellspacing=1 cellpadding=0 style='border:1px solid black'>\n";
for ($i=0; $i <$row; $i++) {
$rs .= "\t<tr>\n";
for ($picIndex,$j=0;
$j < $pics_wide && $picIndex < count($files);
$j++,$picIndex++) {
$rs .= "\t\t<td><a href=index.php?show_image=" .
$files[$picIndex] . ">" .
"<img src=index.php?thumb_image=" .
$files[$picIndex] . " border=0 title='Copyright wedoit4you.com'></a></td>\n";
//$rs .= "<td>i=$i / $j=$picIndex</td>";
}
$rs .= "\t</tr>\n";
}//for
$rs .= "<tr><td colspan=$pics_wide align=center>Free Thumbnail script by <a href=http://www.wedoit4you.com>wedoit4you.com</a><br>Written by Angel Leon (March 2005)</td></tr></table>\n";
return $rs;
} //createThumbTable
function thumbImage($file,$img_height,$waterMark) {
$img_temp = imagecreatefromjpeg($file);
$black = @imagecolorallocate ($img_temp, 0, 0, 0);
$white = @imagecolorallocate ($img_temp, 255, 255, 255);
$font = 2;
$img_width=imagesx($img_temp)/imagesy($img_temp)*$img_height;
$img_thumb=imagecreatetruecolor($img_width,$img_height);
imagecopyresampled($img_thumb,
$img_temp,0,0,0,0,$img_width,
$img_height,
imagesx ($img_temp),
imagesy($img_temp));
$originx = imagesx($img_thumb) - 100;
$originy = imagesy($img_thumb) - 15;
@imagestring ($img_thumb, $font, $originx + 10, $originy,
$waterMark, $black);
@imagestring ($img_thumb, $font, $originx + 11, $originy - 1,
$waterMark, $white);
header ("Content-type: image/jpeg");
imagejpeg($img_thumb, "", 60);
imagedestroy ($img_thumb);
}
?>
Another thing to note, is the file not might actually be a jpeg , even though the filename ends in .jpg. If this is the case the command won't work. You will need imagecreatefromgif()
The easiest way to check is to use your favorite editor like vi.
On Line one it will tell you if its a gif or a jpg..
I took a quick look at a few image files. the gifs say GIF87a and the real jpegs should say JFIF or something like that.
I have to say recompiling PHP from the sources and enabling JPEG support in gd took me awhile to figure out.
Somewhere especially configure --help should have stated that --with-jpeg-dir is MANDATORY if you want to have JPEG support. And even if you did so, it doesn't mean you'll get it. If it's wrongly configured, no error is going to be output, all you get is "no JPEG support". What's more confusing is when JPEG support is disabled phpinfo won't say "JPEG Support: disabled", but just omit the entry so you won't even realize something is wrong.
If you recompile PHP or gd, make sure:
- rm -f config.cache FIRST
- make clean (this helps A LOT), actually you can just delete modules/gd.*, and every *.o in ext/gd. this part actually gave me the best headache
- ./configure --with-jpeg-dir=/usr/lib OR any other directory which contains the BINARY library of libjpeg
- make, make install
phpinfo should now display jpeg support... good luck.
(you lucky guys who already have PHP 5 installed on your server... you don't have to go through all the mess I had)
I made a script to produce, save, and use dynamic buttons simultaneously. If the file exists, it will be shown as usual. If not, this script produces a new image and saves it. You only need the background (back.jpg). Maybe it is useful for somone.
<?php
class Button {
var $ib = 'back.jpg';
var $im;
function Button ($fileName, $string) {
$this -> im = $fileName;
if(!file_exists($this -> im)) {
$this -> _createButton($string);
}
}
function getFileName() {
return $this -> im;
}
function _createButton($string) {
$font = 4;
$width = max(400,(ImageFontWidth($font) * strlen($string)) + 4);
$height = max(20,(ImageFontHeight($font) + 4));
$imgBack=ImageCreateFromJPEG($this -> ib);
$imgText=ImageCreateTrueColor($width,$height);
$textColor = imagecolorallocate ($imgText,90,90,90);
ImageCopy($imgText,$imgBack,0,0,0,0,$width,$height);
ImageString ($imgText,$font,2,2,$string,$textColor);
ImageJPEG($imgText,$this -> im,85);
ImageDestroy($imgBack);
ImageDestroy($imgText);
chmod ($this -> im,0644);
}
}
$button = new Button('button.jpg','button text');
echo '<img src="' . $button -> getFileName() . '">';
?>
The ImageCreateFromJPEG() function is capable of throwing an emalloc() error. If this happens, the script will die, but the error will be in your error logs. You should ensure that you have memory available before creating a large image from a jpeg file.
Concerning the path discussion. A relative path works just fine, if it is used properly. The thing is just to keep track of where in the file system you actually are calling the function from.
E.g. including file A into file B, and then executing file A. Now calls made in file B will act as if they actually are made file A, due to the inclusion. So a well designed filesystem is very important. Also moving a file might lead to this type of path related problems.
Hope this made any sence! :)
I have noticed that Nokia's old camera-phones create non-standard JPEG's.
Nokias' JPEG doesn't end with 0xFFD9. Add 0xFFD9 end of file and image works fine with imagecreatefromjpeg(). Willertan1980 already sent code to do that.
This function DOES accept paths in the filename, just make sure they're absolute paths. A relative path won't work, at least it didn't for me. This is in response to jonlup's comment from june 25:
"I played with "imagecreatefromjpeg()" function and, after a few tests, I found that the filename that it requires as parameter should be only a simple filename: the function does not work if in the string of the filename is specified a path to that file."
here is my clear method to resize images
you can check how it works on http://www.jetevents.pl
<?php
$maxx=100; // maximum width
$maxy=75; // maximum height
$name=strtolower(substr($_FILES['file']['name'],0,-4)).".jpg"; // name of file - must be jpg
$size = GetImageSize ($_FILES['file']['tmp_name']); // params of image
if ($size[0]>$size[1]) {$sizemin[0]=$maxx;$sizemin[1]=$maxy;};
if ($size[1]>$size[0]) {$sizemin[0]=$maxy;$sizemin[1]=$maxx;};
$im=@imagecreatefromjpeg($path); // path to your gallery
$small = imagecreatetruecolor($sizemin[0], $sizemin[1]); // new image
ImageCopyResampled($small, $im, 0, 0, 0, 0, $sizemin[0], $sizemin[1], $size[0], $size[1]);
// below is main function resampling image
ImageDestroy($im); // free memory
if (ImageJPEG($small,$path,100)) // try to save image
{
echo "File $path has been written<br>\n"; // success
echo "size: ".$sizemin[0]."x".$sizemin[1] ."<br>\n";
}
else
{
echo "<font color=red><b>"; // failed to write file
echo "Error ! File has not been written.";
echo "</b></font><br>\n";
};
?>
I played with "imagecreatefromjpeg()" function and, after a few tests, I found that the filename that it requires as parameter should be only a simple filename: the function does not work if in the string of the filename is specified a path to that file.
The quickest workaround found: do a chdir() to the directory of your image file before try to use "imagecreatefromjpeg()" with your file as parameter.
I did not test the other functions (imagecreatefromgd2(), imagecreatefromgd(), imagecreatefromgif() etc.), but I suppose that they work in the same way.
I think that little trick should be specified in the manual.
Using imagecreate() combined with imagecreatefromjpeg() in PHP 4.3.0 and up creates wrong color jpeg's.
Use imagecreatetruecolor() instead of imagecreate() for right color images.
small script that calculates square (in %) of eche color on the PNG image.
<?
$t1=time();
$im1=ImageCreatefrompng('1.png'); //name of the png file
echo "<img src=1.png>";
$widthIm=ImageSX($im1);
$heightIm=ImageSY($im1);
$total=$widthIm*$heightIm;
$cvcol=imagecolorstotal($im1);
for ($i=0; $i<$widthIm; $i++){
for ($j=0; $j<$heightIm; $j++){
$tochka=imagecolorat($im1,$i,$j);
$num[$tochka]=$num[$tochka]+1;
}
}
echo "<br><br>$widthIm x $heightIm ($total pixels).";
echo " Number of colors in pallette - $cvcol<br><br>
";
echo "<table width=400 border =1>";
for ($k=0; $k<$cvcol; $k++) {
$proc=round($num[$k]/$total*100, 2);
$Palitra =ImageColorsForIndex($im1,$k);
$Palitra[red]= dechex($Palitra[red]);
$Palitra[green]= dechex($Palitra[green]);
$Palitra[blue]= dechex($Palitra[blue]);
echo "<tr><td>$k</td><td width=100>$Palitra[red]-$Palitra[green]-$Palitra[blue]</td>";
echo "<td width=100>$proc %</td>";
echo "<td width=100 bgcolor=$Palitra[red],$Palitra";
echo "[green],$Palitra[blue]> </td></tr>";
}
echo "</table>";
imagedestroy($im1);
$t2=-$t1+time();
echo "<br>Time past: $t2 sec";
?>
ImageCreateFromJPEG() as of GD 2.0.15 (as bundled with PHP 4.3.4) doesn't handle 4-channel (with alpha channel) JPG images well, the function fails and emits message 'Unsupported color conversion request' to stderr. The solution I found for this is to use NetPBM tools - 'jpegtopnm < orig.jpg | pnmtojpeg > new.jpg' creates a JPG image PHP GD library can open just fine.
did you found that sometimes it hang the php when imagecreatefromjpeg() run on bad JPEG. I found that this is cause by the JPEG file U used dont have EOI (end of image)
the FF D9 at the end of your JPEG
JPEG image should start with 0xFFD8 and end with 0xFFD9
// this may help to fix the error
function check_jpeg($f, $fix=false ){
# [070203]
# check for jpeg file header and footer - also try to fix it
if ( false !== (@$fd = fopen($f, 'r+b' )) ){
if ( fread($fd,2)==chr(255).chr(216) ){
fseek ( $fd, -2, SEEK_END );
if ( fread($fd,2)==chr(255).chr(217) ){
fclose($fd);
return true;
}else{
if ( $fix && fwrite($fd,chr(255).chr(217)) ){return true;}
fclose($fd);
return false;
}
}else{fclose($fd); return false;}
}else{
return false;
}
}
Here's the answer for your 256 color only problem!!!
use these functions in order then it works fine!
$img_src=imagecreatefromjpeg('yoursource.jpg');
$img_dst=imagecreatetruecolor(20,20);
imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, 20, 20, 20, 20);
imagejpeg($img_dst, $g_dstfile, 100);
imagedestroy($img_dst);
Greetz, GTB
For Windows users who wants to enable the GD libary:
It took me some while to figure this out, but in the end it worked (and still does) great.
1. First download the latest (stable recommended) version of php
2. Unzip to f.ex c:\php\
3. Now you should have a file in c:\php\ that's named php.ini.dist (or something like that). Rename that to php.ini and copy it to the root of you Windows directory.
4. Open the php.ini file (the easiers way is to open the run promnt at your start menu and just type php.ini and hit enter).
5. Search (ctrl+f) for extension_dir. The default value is set to "./", make it to "./extensions"
6. Now you need to find where in the php.ini the modules for Windows is located. Search for gd.
7. Remove the ; char infront of this line: extension=php_gd2.dll
8. Try make a php script with some image functions and see if it works. F.ex $im = imageCreate("test.jpg");
If you get a message that says something like imageCreate function doesn't exist the gd libary is not loaded.
9. That's all. Have fun using GD in Windows :)
As jpsy sugested Windows users can download the zip to get the gd2_dll extension
OR
If you already installed with the windows installer and are too lazy to get the zip you can go here
http://www.coupin.net/gd-freetype/windows.php
Download the php_gd2.dll file put it wherever you want, and change the
extension_dir=C:\php\extensions
Wherever you saved the dll to is the path you put in, remember to uncomment
extension=php_gd2.dll
Do not uncomment the one above for gd.dll (the one without the 2)
Doing a "make clean", regardless of which platform you're on (including MacOS X) should clean up the source tree enough to ensure that config changes take effect...
Note for PHP 4.3 under Mac OS X 10.2.3:
I originally compiled using only --with-mysql --with-apxs. When this compiled correctly (for a change; previous versions didn't), I then tried adding --with-gd --with-jpg-dir and a bunch of other goodies, but they didn't add in. Apparently removing config.cache isn't sufficient. My advice is to simply delete the entire folder, and try your new configure command on a clean untarred source folder.
###--- imagecreatefromjpeg only opens JPEG files from your disk.
###--- To load JPEG images from a URL, use the function below.
function LoadJPEG ($imgURL) {
##-- Get Image file from Port 80 --##
$fp = fopen($imgURL, "r");
$imageFile = fread ($fp, 3000000);
fclose($fp);
##-- Create a temporary file on disk --##
$tmpfname = tempnam ("/temp", "IMG");
##-- Put image data into the temp file --##
$fp = fopen($tmpfname, "w");
fwrite($fp, $imageFile);
fclose($fp);
##-- Load Image from Disk with GD library --##
$im = imagecreatefromjpeg ($tmpfname);
##-- Delete Temporary File --##
unlink($tmpfname);
##-- Check for errors --##
if (!$im) {
print "Could not create JPEG image $imgURL";
}
return $im;
}
$imageData = LoadJPEG("http://www.example.com/example.jpg");
Header( "Content-Type: image/jpeg");
imagejpeg($imageData, '', 100);
[Ed Note: You must have netpbm installed for this to work --alindeman @ php.net]
Just wanted to let you know that
imagecreatefromjpeg crashes php
(command line at least) sometimes with segmentation fault when jpeg is corrupted.
To get rid of the nasty segmentation fault i used
system ("jpegtopnm f.jpg > f.pnm", $r);
if ($r != 0) {printf ("invalid jpeg\n"); return; }
system ("pnmtopng f.pnm > f.png");
$im =imagecreatefrompng ("f.png");
Wow, it only took me 3 hours to get all of the lib paths correct for my install. Some of them are /usr, and some are /usr/lib...go figure. I figured that I would post this in the hopes that it will save somebody some time.
Remember that if you're using rpm installs...you have to install the devel packages. For example, if you're installing mysql from rpm, and you want to compile with support for your particular MySql dist, you must install mysql-devel*.rpm.
Anyway, I'm a redhat 7.1 install...with all appropriate devel packages installed.
./configure \
--with-mysql=/usr \
--with-ftp \
--with-apxs=/home/www/bin/apxs \
--with-xpm-dir=/usr/X11R6 \
--with-gdbm=/usr/lib \
--with-gd=/usr \
--with-zlib-dir=/usr/lib \
--with-jpeg-dir=/usr/lib \
--with-png-dir=/usr/lib \
--with-tiff-dir=/usr/lib \
--with-config-file-path=/home/www/conf \
--with-freetype-dir=/usr/lib \
--enable-magic-quotes \
--enable-track-vars
Basta/Justnoone:
GD no longer supports the GIF format due to legal issues with Unisys (they own the patent for LZW compression used in GIF). See the documentation for GD for more details:
http://www.boutell.com/gd/manual1.8.4.html
In the new versions (PHP 4.0.6, GD 2.0.1), ImageCreateFromJPEG() results in a TRUE COLOR image.
In the older versions, you only get 256 colors.
I just wanted to note here something i found else where that was very helpful to me when using jpeg images. when using imagecreatefromjpeg() it can be difficult to allocate new colors.
The work around i found was posted under imagecolorallocate() and prescribes that you first use imagecreate(), allocate colors, and then copy the jpeg into this image.
For those having trouble getting jpeg support using gd, make sure you
rm config.cache
before reconfiguring php. Otherwise the configure script will assume jpeg support is still not compiled into gd.
In response to my own post:
Maybe this is common knowledge but here is how I solved my problem. Hopefully this will help out seeing how I couldn't find any other articles on this topic with a solution.
This seems to work pretty well. Displays in browser and QT Picture Viewer but for some reason Photoshop won't open it. Translation error. Since I'm just using it to cache the image for when the our content provider goes down no biggie there.
<?php
$si = fopen($imagePathURL, "r"); // open URL
$serverImg = fread($si, 1000000); // read contents
fclose($si); // close file
?>
/* open file to save to (w+ creates if file does not exist || b opens binary safe [Win32]) Seemed to work fine with out the 'b' on Windows NT but just to be safe. */
<?php
$si = fopen($saveImgTo, "w+b");
fwrite($si, $serverImg); // write contents to file
fclose($si); // close file
?>
Hope this helps somebody...long live PHP
Wonder why that's just the only image function you can't get to work? Remember that you have to use a gd library that supports JPEG (make it manually and <important>edit the makefile</important>)! Especially all gd RPMs from SuSE (including 7.0) don't support it as it's not default up to gd 1.8.3.
Be sure to allocate your colors AFTER you used this function or else you might get some strange colors..
To all those having trouble with a message to the effect of:
CreateImageFromJpeg() not supported in this PHP build
Start by adding --with-jpeg-dir to your ./configure options as I left this out (not knowing I needed it) and I spent the best part of 6 hours trying to compile to get this option. (RH 6.2, PHP 4.0.1pl2, Apache 1.3.12, GD 1.8.3)
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