[argyllcms] Re: Neutralize Grey Axis
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 12 Jan 2011 18:45:22 +1100
edmund ronald wrote:
Graeme, when viewing newsprint the viewer will adapt to paper white.
But when densely printed crop-framed photos are viewed, the adaptation
will be to an external white point; what it is I don't really know,
but I would say that flat white reflecting the ambient light makes as
much sense as some yellowish paper white.
It's fine in practice that the viewer is adapted to something
other than the paper white, but it's not reasonable to expect the
color management systems is able to mind read the situation. I don't
think that a hack such as assuming the source is on a spectrally flat media,
and bending the white point (things unrelated to the observers state of
adaptation) is a scientific approach either.
Assuming that the observer is fully adapted to the media is
a very reasonable assumption in the face of no other information,
and works well 99% of the time.
What other assumption would one make ?
As for invoking the ICC, I
don't see much color science there, rather an enshrining of existing
print practice, and modern practitioners may take a different tack - I
personally hate "follow the party line" approaches in software, and
open source has usually made a point of catering to minorities.
Be that as it may, I think it's pretty important to get to the bottom
of the understand the underlying problem, so that a fundamentally good
solution can be developed, rather than applying hacks or simply copying what
someone else has done, without understanding why it is needed or
what it does.
Graeme Gill.
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