Gamma calibration
Gamma calibration
- Subject: Gamma calibration
- From: Roger Breton via colorsync-users <email@hidden>
- Date: Sat, 11 Jan 2020 22:13:30 -0500
Making progress on my calibration project.
I have a question with regards to the merits of pure gamma calibration.
The following graph shows the relationship between 8-bit input RGB numbers
and measured output Luminance, from 0 to 255:
https://1drv.ms/b/s!AkD78CVR1NBqktJmMSOB1tc6aOdiwg?e=5ujwEq
The horizontal axis represents Input RGB numbers, from 0 to 255, as they
would come out of Photoshop, and the vertical axis represent Output
Luminance, as measured on the face of the monitor.
There are two "curves" on this graph, a "blue" curve and a "red" curve. The
blue curve represent the measured response of a Dell 17" laptop while the
red curve represents a 2.2 gamma, as best as I can calculate it.
Judging by the shape of the graph in the shadows, I am tempted to concluded
that there is "poor separation of tones"? I would say, from 0 to 25,
increasing RGB counts practically map to the same Luminance value? This
"gamma calibration method" does not make sense to me. Whether 2.2 or 1.8, I
don't see how the "response" could be improved at the shadows end? Which
makes me wonder whether the other "popular" calibration schemes create
better shadow separation? Like L* or sRGB? Worth investigating..
/ Roger Breton
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