Can you elaborate why you need two steps?
Btw. lcms does no automatic inversion of profiles.

kind regards
Kai-Uwe Behrmann
-- 
developing for colour management 
www.behrmann.name + www.oyranos.org


Am 01.10.10, 13:58 -0400 schrieb Mike Marcoe:
> I have a CMYK->CMYK profile that I've chained with a device link profile to
> apply tonal correction to the image. This works as expected. I now want to
> separate this into 2 passes and I find that making 2 transforms does not
> work. I get an Invalid PCS error from cmsCreateTransform. The PCS is invalid
> because it is CMYK and cmsCreateTransform is expecting Lab or XYZ.


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