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I use GIMP for my editing and I needed to convert an RGB file into CMTK. I found that I can do that using a GIMP plug-in called Separate. I followed all instructions for MAC as specified in the documentation to get it installed, but it wasn’t successful.

The page for the plug-in I am trying to install:

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Try this build of GIMP for mac:

I haven't tried it yet (downloading now), but documentation says it has Separate+ bundled in.

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