Command line CMYK <=> RGB works, Imagick does not.

[NitroPye]

I am having some issues getting CMYK <=> RGB conversion working with Imagick. I am able to do this properly on the command line but when I do it thru Imagick I get improper colors.

Here is the convert command I use from the command line client:

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convert Test_CMYK.psd -profile ColorArt85290.icc -profile sRGB.icc -colorspace RGB Test_RGB.png

This works perfectly and colors are okay. But when I do this colors are messed up (as though I'm doing the CMYK conversion incorrectly)

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$img = new Imagick("File.psd");
$img->setImageFormat('jpeg');
$img->profileImage('ColorArt85290', 'ColorArt85290.icc');
$img->profileImage('sRGB', 'sRGB.icc');
$img->setImageColorspace(imagick::COLORSPACE_RGB);
header( "Content-Type: image/jpeg" );
echo $img;

Has anyone successfully used Imagick with CMYK images?

[mkoppanen]

On the first example you get png output and on the second one there is jpeg output. I don't know if that makes a difference. Can you post the images and profiles so that I can test?

[NitroPye]

Using png for the Imagick example doesn't work either. I tried jpeg, because I wanted to set the image format to something that could handle CMYK in memory (to rule that out)

Here are the color profiles and example images I am using. I choose this example image because it has a ton of green making it very easy to tell when CMYK -> RGB goes wrong:

http://cole.nitroy.com/Files/Temp/IM_Test/

[mkoppanen]

using ImageMagick 6.4.0 03/31/08 Q16 http://www.imagemagick.org exactly the same results from command line and Imagick. The green colored image.

[NitroPye]

Against the source image? On my end I get two different green images, one dark (correct), one very bright. I would love for this to be a simple goof up on my end as this is a problem I will eventually need to work around no matter what.

Here are the exact files I used:

• sRGB.icc
  ColorArt85290.icc
  Test_CMYK.psd
  Test_Convert.jpeg
  Test_Imagick.jpeg

And to rule out any version discrepancies here are the versions I am running:

ImageMagick version

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coleman@babylon IM_Test $ convert --version
Version: ImageMagick 6.4.0 04/04/08 Q16 http://www.imagemagick.org

Imagick version

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imagick module version	2.1.1

[NitroPye]

*bump*

Anyone able to do a CMYK to RGB conversion with Imagick?

[NitroPye]

Many versions of ImageMagick and Imagick later I am still coming up against this issue.

Here is the exact code I am using with PHP:

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<?php
$img = new Imagick("Test_CMYK.psd");
$img->setImageFormat('png');
$icc = file_get_contents('ColorArt85290.icc');
$img->profileImage('ColorArt85290', $icc);
$icc = file_get_contents('sRGB.icc');
$img->profileImage('sRGB', $icc);
$img->setImageColorspace(imagick::COLORSPACE_RGB);
header( "Content-Type: image/png" );
echo $img;
?>

And here is the exact code I am using via the command line:

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convert Test_CMYK.psd -profile ColorArt85290.icc -profile sRGB.icc -colorspace RGB Test_RGB.png

The exact files I am using from ICC profiles to Image files are located here:
http://cole.nitroy.com/Files/Temp/Test_IM.zip

I even changed my delegates.xml file and altered all ghostscript delegates as mentioned in this article: http://john.ukmn.com/2007/06/19/imagema ... yk-to-rgb/

ImageMagick version 6.4.9-1
Imagick version 2.2.2RC4
Running on an Intel Mac as a 32bit binary on OS X 10.5.6 & 10.5.2

I have a feeling it has to do with the order of how I am doing things with Imagick in PHP that is the issue. The image created by the PHP Imagick is light washed out green while the original has dark deep greens. I've tried just about everything, has anyone at all been able to take a CYMK image in and spit out proper RGB out???

[mkoppanen]

Hello,

are you after this kind of output:

http://valokuva.org/~mikko/tests/Test_IM/test_out.png

[NitroPye]

Yep thats exactly it!

Were you able to get that output via Imagick?

[mkoppanen]

Yep thats exactly it!

Were you able to get that output via Imagick?

Yes, I was. Here is the script I used:

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<?php
$img = new Imagick("Test_CMYK.psd");

$icc = file_get_contents('sRGB.icc');
$img->profileImage('ICC', $icc);

$img->setImageColorspace(imagick::COLORSPACE_RGB);

$img->setImageFormat('png');
header( "Content-Type: image/png" );
echo $img;

I was able to reproduce the original problem you had with following convert command:

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convert Test_CMYK.psd -profile sRGB.icc -profile ColorArt85290.icc -colorspace RGB Test_RGB.png

Looks like the latter profile overrides the first one.

[NitroPye]

Whooha! That was it!

I don't know how in all of my mucking about I didn't end up with using just the one profile.

Thanks a ton!

I owe you a pint!