Legacy ImageMagick Discussions Archive

Hello all,

Been having some issues converting CMYK files to RGB. If I am missing something elementary let me know but what I am trying to do worked in an older version of IM (6.2.*).

To start here are the files I used for testing:

• http://cole.nitroy.com/Files/Temp/IM_Test/Test_CMYK.psd

• http://cole.nitroy.com/Files/Temp/IM_Te ... rofile.psd

• http://cole.nitroy.com/Files/Temp/IM_Te ... t85290.icc

• http://cole.nitroy.com/Files/Temp/IM_Test/sRGB.icc

I would then try to using convert to make these into RGB PNGs. The files that are then produced are goofed up color-wise. They are washed out and super bright. I choose the example image because it seems greens mess up the most. I feel like a channel is missing or something rather simple. Again, I am still not 100% certain I am not at fault and could be missing something elementary.

• http://cole.nitroy.com/Files/Temp/IM_Test/Test_RGB.png

• http://cole.nitroy.com/Files/Temp/IM_Te ... rofile.png

I then tried converting via the profile switch with the same results.

For one last crack at it, I assumed the PSD was at fault so I converted it to a CMYK tif then tried to convert that to a RGB png with the same whacky color results.

Please don't hesistate to ask for any other details or test files. I am running version 6.4.0-4 on a Intel Mac Pro running 10.4.

Thanks in advance.

We got reasonable results with this command:

• convert Test_CMYK.psd -strip -profile USWebCoatedSWOP.icc -profile sRGB.icc Test_RGB.png

We are using ImageMagick 6.4.0-3. Make sure your version of ImageMagick includes support for the LCMS delegate library. Type

• identify -list configure

and check to ensure lcms is associated with the DELEGATES tag.

magick wrote:We got reasonable results with this command:

• convert Test_CMYK.psd -strip -profile USWebCoatedSWOP.icc -profile sRGB.icc Test_RGB.png

This works for me too. The key seems to be the -profile USWebCoatedSWOP.icc. Out of curiosity where did you come up with that particular profile? The image has a different profile embedded.

magick wrote: We are using ImageMagick 6.4.0-3. Make sure your version of ImageMagick includes support for the LCMS delegate library. Type

• identify -list configure

and check to ensure lcms is associated with the DELEGATES tag.

Yep lcms is associated.

Thanks again.

Added the above solution to IM Examples, Formats, PSD and will appear in a day or two.
http://www.imagemagick.org/Usage/formats/#psd