I thought that one of the beauties of ICC profiles is that each
profile characterizes one device. So for N devices we need just N
profiles, all combinations of them are "calculated" at run time
(notable exception being device link profiles). But using
information in profile X to create a LUT of device Y seems to
break this rule - would I then have to create as many display
profiles as I have output devices? Maybe I got something
fundamentally wrong about CM.
It's a fine theory, and works nicely for the device characterization,
but gamut mapping isn't divisible this way, so it doesn't work for
pre-computing gamut mappings. You can only do a really good gamut
mapping if you know the source and the destination. It's something
the ICC format hasn't really tackled properly, and one of the things
that prompted the creation of WCS (Windows Color System).
