[argyllcms] Re: device link profiles

Rolf Gierling wrote:

Hello Graeme, hello list,

I have a devicelink profile (CMYK to CMYK) and
I need that to be reverted.

So, what I need is not the way source to destination,
but destination to source.

Any ideas how to manage this? 

There's no ready made utility, you'd have to
code something together.

The main problem is that such a device link may or
may not have a 1:1 mapping. If the CMYK to CMYK was
one created from a CMYK->PCS->CMYK, then there will
be no unique solution for a given CMYK, but a locus
of solutions, just like inverting CMYK->PCS. If this
was the case, then the CMYK->CMYK could be
converted to a CMYK->PCS table, and then inverted
as a two step.

If the CMYK->CMYK keeps the black generation,
then there may be unique inversions for much of the gamut,
and in theory the rspl inversion code can be used.

If the nature of the CMYK->CMYK is unknown, then I'm
not sure how you would handle it. The rspl inversion code
may give you solutions, but there could be a very large
number of them returned, along a locus.

It might be better to explain why you want to invert
a CMYK->CMYK device link profile, as there may be ways
of avoiding such a step.

Graeme Gill.

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