[argyllcms] Re: device link profiles

Graeme Gill wrote: 
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.


To add to this, there is also the opposite problem
present, that for most CMYK values, there will be
no inverse (since the CMYK values that come out of such
a device link occupy a 3D "surface" within a 4D "volume").
For such values, you either have to cope with no answer,
or define some sort of "nearness" measure to be able
to return the input that gives the nearest value to your value.

Graeme Gill.

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