The functions near the end of the script , imagejpeg and imagepng , also accept a third parameter for quality. Imagejpeg defaults to 75%, where you can set it to 100. imagepng is on a scale of 0-9 where 0 is no compression.

example on line 86:

switch ( $info[2] ) {
case IMAGETYPE_GIF: imagegif($image_resized, $output); break;
case IMAGETYPE_JPEG: imagejpeg($image_resized, $output, 100); break;
case IMAGETYPE_PNG: imagepng($image_resized, $output, 0); break;
default: return false;
}

Thanks... though I totally forgot on which site I used this... :-)