function colorizeImage($img, $targetColor, $baseColor)
{
$cachefile = $this->_folder . 'colorize' . md5($img) . $targetColor . $baseColor . '.' . $this->_filetype;
if (!NextendFilesystem::existsFile($cachefile)) {
$targetHexArr = NextendColor::hex82hex($targetColor);
$targetColor = $targetHexArr[0];
$alpha = hexdec($targetHexArr[1]);
$c1 = NextendColor::hex2hsl($baseColor);
$c2 = NextendColor::hex2hsl($targetColor);
$im = imagecreatefrompng($img);
$width = imagesx($im);
$height = imagesy($im);
$this->createIm($width, $height);
$rgb = NextendColor::rgb2array($targetColor);
for ($x = 0; $x < $width; $x++) {
for ($y = 0; $y < $height; $y++) {
$rgba = ImageColorAt($im, $x, $y);
$rgb = array($rgba >> 16 & 0xff, $rgba >> 8 & 0xff, $rgba & 0xff);
$hsl = NextendColor::rgb2hsl($rgb);
$a[0] = $hsl[0] + ($c2[0] - $c1[0]);
$a[1] = $hsl[1] * ($c2[1] / $c1[1]);
if ($a[1] > 1) {
$a[1] = 1;
}
$a[2] = exp(log($hsl[2]) * log($c2[2]) / log($c1[2]));
if ($a[2] > 1) {
$a[2] = 1;
}
$rgb = NextendColor::hsl2rgb($a);
$A = 0xff - ($rgba >> 24) * 2 & 0xff;
$A = (int) ($A * ($alpha / 0xff));
if ($A > 0xff) {
$A = 0xff;
}
$A = (int) ((0xff - $A) / 2);
imagesetpixel($this->_im, $x, $y, imagecolorallocatealpha($this->_im, $rgb[0], $rgb[1], $rgb[2], $A));
}
}
$this->saveIm($cachefile);
imagedestroy($im);
}
return NextendFilesystem::pathToAbsoluteURL($cachefile);
}
