Modify a DisplayCAL profile gamma without instruments?

[mammeta puttana]

Hello, an user kindly offered me his gamma cal for y27q-20 which unfortunately doesn’t have gamma adjustment.

He gave me a 2.4 icc profile, however this is just slightly too dark, i’d like to put the value to 2.35 or 2.3…  would be perfect.

Thank you.

• This topic was modified 4 years, 2 months ago by mammeta puttana.

[Vincent]

Do you have .cal file? It’s text:
-open spreadsheet
-column 1: 256 step from 0.0 to 1.0
-column 2: apply gamma “2.3” (whatever you want*) to 1
-column 3: apply gamma 2.4 to 1
-column 4: going from 2.4 to 2.3*
-columns 5-7: “cal” RGB data correction to video LUT with uncalibrated screen “1.x-2.x” going to some kind of 2.4.
-columns 8-10: correct cal data with 4

Then save to another cal. file, and maybe using ArgyllCMS command line embed that cal to a copy of your profile or some synth verison of its primaries & white.

But without measurements… it would a guess.

• This reply was modified 4 years, 2 months ago by Vincent.

[mammeta puttana]

I have .ICC profile made from another user… i just want slightly less gamma than 2.4. 2.2  is washed out and 2.4 too dark, 2.3 would be balanced

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