How should we handle CMYK images that, for example, need to be upscaled in topaz?
We use it a lot for upscaling, as we often get lowres images to be printed - but we don’t want image conversion to RGB, as we have to print in CMYK.
So how do we best get around this before Topaz can hopefully handle CMYK soon?
And can we at least get a warning when we upload CMYK so we can be aware of the problem?
Topaz Photo AI only works with RGB, I have added this thread to our Ideas and Suggestion section so be sure to that you do not forget to vote for your idea 
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Think it could start not to convert from CMYK to RGB - just let the colours be as it is
