gistfile1.php

<?
function ReduceColorDepth(&$gdimg, $colors=256, $dither=true) {
	$colors = max(min($colors, 256), 2);
	// ImageTrueColorToPalette usually makes ugly colors, the replacement is a bit better
	//ImageTrueColorToPalette($gdimg, $dither, $colors);
	phpthumb_filters::ImageTrueColorToPalette2($gdimg, $dither, $colors);
	return true;
}
?>