Unable to determine effective Video LUT entry bit depth

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  • #33707

    Emil Ingelman Sahlen
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    When I run the “Report on uncalibrated display”, it fails to determine the VideoLUT depth for my externally connected BenQ SW320 with the following message:

    “Unable to determine effective Video LUT entry bit depth”

    OS: macOS 12.1 Monterey
    DisplayCAL version: 3.8.9.3
    ArgyllCMS version: 2.3.0
    Computer: MacBook Pro 14″ M1 Pro 10 core
    Display: BenQ SW320

    #33713

    Vincent
    Participant
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    That means that “visually” your GPU can provide more that 8bit corrections loaded into GPU LUT. Good.

    #33714

    Emil Ingelman Sahlen
    Participant
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    Ah, because on my Windows machine it said that the effective bit depth was 10 bits (sometimes, unless the Nvidia driver starts glitching). I interpreted the inability to determine as something being wrong but you’re saying that it’s actually good news?

    #33722

    Vincent
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    I test if it can measure a difference. It is not an actual test of VCGT bit depth.
    “8bit” means “I can measure truncation”.
    “>8bit” (or even cannot determine) means “I can measure that after varying VCGT beyond 8th bit I can measure a change in output”

    8bit bad, otherwise ok (although even with >8bit actual dithering is prefered to avoid banding caused by VCGT calibration loaded to GPU)

    • This reply was modified 4 months ago by Vincent.
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