SCALA GRIGI
//to black and white
if(!file_exists('dw-bw.png')) {
$img = imagecreatefrompng('dw-manipulate-me.png');
imagefilter($img,IMG_FILTER_GRAYSCALE);
imagepng($img,'db-bw.png');
imagedestroy($img);
}
NEGATIVO
//to negative
if(!file_exists('dw-negative.png')) {
$img = imagecreatefrompng('dw-manipulate-me.png');
imagefilter($img,IMG_FILTER_NEGATE);
imagepng($img,'db-negative.png');
imagedestroy($img);
}
COLOR SEPPIA
//to black and white
if(!file_exists('dw-sepia.png')) {
$img = imagecreatefrompng('dw-manipulate-me.png');
imagefilter($img,IMG_FILTER_GRAYSCALE);
imagefilter($img,IMG_FILTER_COLORIZE,100,50,0);
imagepng($img,'db-sepia.png');
imagedestroy($img);
}
fonte: www.sastgroup.com
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