Greg Sullivan wrote:
Graeme Gill wrote:
As well, this is contradicted by the ICC spec. itself:
ICC V4.2 page 8:
"The media-relative colorimetric transform is useful for colours
that have already been mapped to the intended reproduction
media-relative colorimetry, whereas the ICC-absolute colorimetric
transform is useful for spot colours, and when simulating one
medium on another in proofing applications."
If my understanding of what the ICC were saying, then the above only
applies to print, at least currently.
There is no such qualification regarding print, near the above statement
in the ICC spec. If this were the intention (and I certainly hope it
isn't), then I'd expect it to be in the spec.
They didn't even seem to understand why one would
want to maintain the XYZ, viz:
" If you really want the D50 white to be displayed why not set up your
monitor to D50? You haven't answered that and I do need to know why that is
a problem if I am to report it as I am sure that will be what will be said
to me."
Umm. Gob smacking. It's hard to know where to start.
1) Suggesting changing a display to D50 is a workaround, not a solution for
a problem of principle in the ICC spec.
2) If it were really the "correct way of proceeding", then the implication
is that ICC profiles can only be applied to D50 white point displays,
and are useless as a characterization for anything else (since the ability
to match spot colors is not supported unless the display has a white point
of D50). In other words, ICC is a "relative only" profiling format, and
therefore there is an urgent need to replace it with something else that
supports absolute characterization, so that important uses such as
proofing and spot color matching can be implemented.
Graeme Gill.
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