[argyllcms] Re: Display LUT depth and Gamma
- From: Roger Breton <graxx@xxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 22 Dec 2011 20:41:55 -0500
Phil,
You wrote "I can see how it may compress the available steps.".
My question is can you "measure" it?
Roger
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Philip Reed
Sent: December-22-11 2:35 PM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Display LUT depth and Gamma
Hello Everyone,
I've had great success with argyllcms but have a couple of nagging questions
that someone may be able to answer.
1:
I have a wide gamut Dell U2711. My understanding of the best
calibration/characterization scenario is to bring the display as close to
the desired setup with on-screen settings and then fine tune with the
profile. I could get reasonably close to 120 luminance and neutral grey
with the "Custom Color" that leaves the red at 100, green at 98 and blue at
100. A year in the display has aged a bit and now red at 99, green at 95
and blue at 100 give a neutral characterization while bumping up the
brightness a bit. As you probably know, Custom Color is the only setting
that allows access to the RGB controls.
My question is this: Does setting the RGB levels to anything less than 100
limit the available color palette? I seem to recall reading that lowering
the setting for green (as an example) reduces the size of the internal LUT
for that channel. Is this based on bit depth? I can see how it may
compress the available steps.
Given this monitors settings, would it be just best to set it to "Standard",
adjust brightness and then profile?
2:
I work in a dark room and when I run "Report on Uncalibrated Display" get a
gamma of 2.0. My choice of settings is color temp. 6500K, white level 120,
black level: 0.13 and gamma 2.2. The results look excellent but if I run a
"Report on Calibrated Display", the gamma is 2.8. Can someone explain this?
Is this indicative of what people refer to as "crushed blacks"?
Thank You - Phil
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