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(PECL imagick 2.0.0)
Imagick::paintTransparentImage — Changes any pixel that matches color with the color defined by fill
Diese Funktion ist bis jetzt nicht dokumentiert. Es steht nur die Liste der Argumente zur Verfügung.
Changes any pixel that matches color with the color defined by fill.
Change this target color to specified opacity value within the image.
The level of transparency: 1.0 is fully opaque and 0.0 is fully transparent.
The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same.
Liefert TRUE bei Erfolg.
Wirft ImagickException bei Fehlern.
| Version | Beschreibung |
|---|---|
| 2.1.0 | Now allows a string representing the color as the first parameter. Previous versions allow only an ImagickPixel object. |
Actually it does seem to work just not the way expected perhaps.
Looking at the fuzz option on ImageMagick's site (http://www.imagemagick.org/script/command-line-options.php#fuzz), "The distance can be in absolute intensity units or, by appending % as a percentage of the maximum possible intensity (255, 65535, or 4294967295)."
As it requires a float, the percentage value won't work so it actually one of the max intensity values. In my case, the images I was working with seemed to have max intensity values of 65535. So a fuzz of 6500, for roughly 10%, seemed to do the trick.
The part that might be problematic though is how do you determine the max intensity of a color/image? Using a static 6500 would be fine until I would have to convert an image with a max intensity other than 65535. If it's 255 it would wipe the entire image. Or fall far short on the fuzz with the larger value.
Fuzz attribute doesn't work here.
#!/usr/bin/php
<?php
if(!isset($argv[1])) die("input file\n");
$im = new Imagick( $argv[1] );
$im->paintTransparentImage('rgb(246,241,230)', 0.0, 10);
file_put_contents('transparent_'.$argv[1], $im);
?>
Will "remove" only colors that match exactly rgb(246,241,230)
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