GD and ICC profile

[golgote]

I have both GD and Imagick installed in my PHP. In my PDF, I use an image created with Imagick on which I add a CMYK profile for printing (CoatedFOGRA39.icc).

$img->setImageFormat('jpeg');
$img->getImageProfiles('*', null);
$icc_cmyk = file_get_contents('CoatedFOGRA39.icc');
$img->profileImage('icc', $icc_cmyk);
$img->transformImageColorspace(Imagick::COLORSPACE_CMYK);

$pdf->Image('@'.$img, $x, $y);

The resulting PDF generated with TCPDF has bad colors so the profile I give is not used and is replaced by something else or is simply removed.

I tracked this down to the Image() function. If GD is installed, it uses imagecreatetruecolor() and other functions that modify the original image and its data. If I comment out the block starting at if (($info === false) AND function_exists($gdfunction)) { then TCPDF correctly uses imagick and everything is fine because it finds the icc profile and keeps it.

So here are my suggestions to fix this:

1. Change the order, call imagick before GD (imagick is better at everything so it should benefit everyone, but it is a potential BC break)
2. Add a parameter to specify which image library to use. Most php image libraries do this these days. Keep this parameter empty by default. Example:

$pdf->setImageLibrary('imagick');

Any ideas?

[Gregoraz]

A little bit late, but:

        $iccCMYKPath = 'Coated_Fogra39L_VIGC_300.icc';
        $iccRGBPath = 'AdobeRGB1998.icc';
        $img->stripImage();
        $img->setImageColorspace(Imagick::COLORSPACE_SRGB);
        $icc_rgb = file_get_contents($iccRGBPath);
        $img->profileImage('icc', $icc_rgb);
        unset($icc_rgb);
        $icc_cmyk = file_get_contents($iccCMYKPath);
        $img->profileImage('icc', $icc_cmyk);
        $img->setImageColorspace(Imagick::COLORSPACE_CMYK);
        unset($icc_cmyk);
        $img->stripImage();

As far as I remember, I had to first profile image with rgb and then profile it with fogra.