PHP Reducing all image types quality
compression, image, image-compression, php
Solution
To convert any PNG image to 8-bit PNG use this function, I've just created
function convertPNGto8bitPNG()
function convertPNGto8bitPNG($sourcePath, $destPath) {
$srcimage = imagecreatefrompng($sourcePath);
list($width, $height) = getimagesize($sourcePath);
$img = imagecreatetruecolor($width, $height);
$bga = imagecolorallocatealpha($img, 0, 0, 0, 127);
imagecolortransparent($img, $bga);
imagefill($img, 0, 0, $bga);
imagecopy($img, $srcimage, 0, 0, 0, 0, $width, $height);
imagetruecolortopalette($img, false, 255);
imagesavealpha($img, true);
imagepng($img, $destPath);
imagedestroy($img);
}
Parameters
$sourcePath - Path to source PNG file $destPath - Path to destination PNG file Usage
convertPNGto8bitPNG('pfc.png', 'pfc8bit.png');
Problem
I am looking for a library that can reduce all image types quality (PNG, GIF and JPEG). I know that I can reduce JPEG using `imagejpeg()` I also know that I can reduce PNG using `imagepng()` although this is not powerful enough. I need something that can convert PNG 24 to PNG8 without removing the alpha. Can't use ImageMagick since I cannot install anything on my server. EDIT: I also need something that can convert from 32 bit to 8 (which I am pretty sure is the same like from 32) Found the soultion here Thanks