Modify a DisplayCAL profile gamma without instruments?

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  • #22486

    mammeta puttana
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    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.

    #22491

    Vincent
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    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 1 month, 4 weeks ago by Vincent.
    #22501

    mammeta puttana
    Participant
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    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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