Trying to resize a png 256 colors image and save it in 256 colors with a correct color palette ? (if you'll save a 256 color image in truecolor palette the result image will have a big size).
I spent some hours trying various function to get a good quality 256 color png image, but because of color palette the result image quality was awful.
But thank to the comment of zmorris at zsculpt dot com from imagetruecolortopalette function page, i figured out how to get a properly image!
<?php
function resize_png($src,$dst,$dstw,$dsth) {
list($width, $height, $type, $attr) = getimagesize($src);
$im = imagecreatefrompng($src);
$tim = imagecreatetruecolor($dstw,$dsth);
imagecopyresampled($tim,$im,0,0,0,0,$dstw,$dsth,$width,$height);
$tim = ImageTrueColorToPalette2($tim,false,255);
imagepng($tim,$dst);
}
function ImageTrueColorToPalette2($image, $dither, $ncolors) {
$width = imagesx( $image );
$height = imagesy( $image );
$colors_handle = ImageCreateTrueColor( $width, $height );
ImageCopyMerge( $colors_handle, $image, 0, 0, 0, 0, $width, $height, 100 );
ImageTrueColorToPalette( $image, $dither, $ncolors );
ImageColorMatch( $colors_handle, $image );
ImageDestroy($colors_handle);
return $image;
}
?>
Good luck,
Namolovan Nicolae, Moldova
