[argyllcms] Re: Contrast vs Brightness on my LCD monitor and related questions

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 06 Dec 2008 17:15:03 +1100

Leonard Evens wrote:
One thing that confuses me is that by appropriate choice of the default
gamma setting---the monitor offers 3 possible settings, dispcal -r shows
gamma = 2.2., but after calibrating/profiling and loading the
calibration into the video LUT via xcalib, I get quite high gammas, in
the range 2.6 to 3.1.  I've even tried using the argument -g 2.2, but
that doesn't seem to make any difference..

Gamma is hard to measure, because no-one can agree on
exactly what it is. If you use ambient light adjustment,
then the gamma may be boosted to increase the contrast.

Normally the "dispcal -r" report should agree reasonably
with the target set using -g, if ambient compensation is
not being used.

Graeme Gill.

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