public 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;
}
