Set a color as transparent in palette-based image
- by NeDark
Hello there!
I want to convert a alpha transparent png image to palette based png image.
In GD I can do it easy:
// We have already the image loaded in $source_img
$w=200; $h=200; // We supose that img dimensions are 200x200
$img = imagecreatetruecolor($w, $h); // New black image
list($r, $g, $b) = array(200, 200, 200); // Some color that doesn't appear in image to avoid conflict
$color = imagecolorallocate($img, $r, $g, $b);
imagefill($img, 0, 0, $color); // Fill the black image with the chosen color.
imagecolortransparent($img, $color); // Set the chosen color as transparent
$res = imagecopyresampled($img, $source_img, 0, 0, 0, 0, $w, $h, $w, $h);
But in Imagick I don't know how set a color as transparent (imagecolortransparent() in GD). I have spent hours searching on the internet, but the help in the php site isn't very comphrensive and there are many undocumented functions.
Thanks.
