(PHP 4 >= 4.3.0, PHP 5, PHP 7)
imagecolormatch — Makes the colors of the palette version of an image more closely match the true color version
imagecolormatch ( resource $image1 , resource $image2 ) : bool
Makes the colors of the palette version of an image more closely match the true color version.
image1
A truecolor image resource.
image2
A palette image resource pointing to an image that has the same size as image1.
Returns true on success or false on failure.
Example #1 imagecolormatch() example
<?php
// Setup the true color and palette images
$im1 = imagecreatefrompng('./gdlogo.png');
$im2 = imagecreate(imagesx($im1), imagesy($im1));
// Add some colors to $im2
$colors = Array();
$colors[] = imagecolorallocate($im2, 255, 36, 74);
$colors[] = imagecolorallocate($im2, 40, 0, 240);
$colors[] = imagecolorallocate($im2, 82, 100, 255);
$colors[] = imagecolorallocate($im2, 84, 63, 44);
// Match these colors with the true color image
imagecolormatch($im1, $im2);
// Free from memory
imagedestroy($im1);
imagedestroy($im2);
?>
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https://www.php.net/manual/en/function.imagecolormatch.php