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(PECL imagick 2.0.0)
Imagick::cropThumbnailImage — Creates a crop thumbnail
Diese Funktion ist bis jetzt nicht dokumentiert. Es steht nur die Liste der Argumente zur Verfügung.
Creates a fixed size thumbnail by first scaling the image up or down and cropping a specified area from the center.
The width of the thumbnail
The Height of the thumbnail
Liefert TRUE bei Erfolg.
Wirft ImagickException bei Fehlern.
In my opinion this function is not working as expected, tested for imagemagick version 6.3.7
As described above, the function returns an image with a fixed height and a variable width. Here's a fix that will return a cropped thumbnail with the defined dimensions, without variations in the dimensions.
<?php
// define widescreen dimensions
$width = 160;
$height = 90;
// load an image
$i = new Imagick("your image file");
// get the current image dimensions
$geo = $i->getImageGeometry();
// crop the image
if(($geo['width']/$width) < ($geo['height']/$height))
{
$i->cropImage($geo['width'], floor($height*$geo['width']/$width), 0, (($geo['height']-($height*$geo['width']/$width))/2));
}
else
{
$i->cropImage(ceil($width*$geo['height']/$height), $geo['height'], (($geo['width']-($width*$geo['height']/$height))/2), 0);
}
// thumbnail the image
$i->ThumbnailImage($width,$height,true);
// save or show or whatever the image
$i->setImageFormat("png");
header("Content-Type: image/png");
exit($i);
?>
I found a relevant posting complete with demo code at this site:
http://valokuva.org/?p=8
Sample code goes like this:
<?php
/* Read the image */
$im = new imagick( "test.png" );
/* create the thumbnail */
$im->cropThumbnailImage( 80, 80 );
/* Write to a file */
$im->writeImage( "th_80x80_test.png" );
?>
This is a specialization of the cropImage method. At a high level, this method will create a thumbnail of a given image, with the thumbnail sized at ($width, $height).
If the thumbnail does not match the aspect ratio of the source image, this is the method to use. The thumbnail will capture the entire image on the shorter edge of the source image (ie, vertical size on a landscape image). Then the thumbnail will be scaled down to meet your target height, while preserving the aspect ratio. Extra horizontal space that does not fit within the target $width will be cropped off evenly left and right.
As a result, the thumbnail is usually a good representation of the source image.
$image = new Imagick($path."test1.jpg");
$image->cropThumbnailImage(160,120); // Crop image and thumb
$image->writeImage($path."test1.jpg");
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