Re[2]: fundamental question - monitor profile as working RGB?
Re[2]: fundamental question - monitor profile as working RGB?
- Subject: Re[2]: fundamental question - monitor profile as working RGB?
- From: Peter Karp <email@hidden>
- Date: Wed, 10 Dec 2003 15:22:45 +0100
Chris Murphy schrieb am 09.12.2003:
>
On Dec 9, 2003, at 5:35 PM, Graeme Gill wrote:
>
>
I'd be rather surprised (read horrified) if any of the packages assume
>
that a display is grey balanced.
>
>
It is easily verifiable. Create an RGB black to white gradient in
>
Photoshop, set the info palette to display RGB and LAB simultaneously,
>
move your cursor around. a*=0, b*=0. If yours doesn't, please send me
>
your display profile and let me know what created it because that's
>
what I'm looking for.
Mmh, I doubt that this is a vaild test for a profiling software to
determine if it assumes gray-balance. I agree with Graeme that most if
not all "monitor measuring software" try to create a perfect gray balance
in the step of creating correction values for the LUT of the video card.
In the second step when the display is profiled the current color values
for the calibrated display could be measured and would make it into the
profile. But I think Graeme has no other chance then to be horrified ;-),
because the calibration packages I know just show the color patches
_once_ in the uncalibrated state of the display (this means, they flatten
the LUT before the measurements). So I assume that the profiling part of
the software assumes a perfect gray balance applying the correction
values to the LUT. Otherwise the profiling step would have to be a
divided part where the color patches would be measured a second time --
but this time with the calibration done in the hardware of a display and
with the calibration values loaded on the LUT.
>
> It defeats the purpose of profiling.
That's a good "question". It depends on how accurate the calibration part
of the display really works.
Regards
Peter
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