generating 3Dlut with 2012_2 observer must use relative intent?

[NoVoicemail]

When generating 3Dlut after calibrating with 2012_2 observer, is relative the only correct intent? What happens if we select absolute colorimetric with white point scaling, does the white point return to 1931 observer D65?

[Vincent]

It will reencode white from source ICC WP coordinates to destination ICC WP, whatever they are.

If you tweak RGB gains to get 2012_2  D65, but you created ICC profile 1931 2 then it will store 1931_2 XYZ coordinates (DisplayCAL use it AFAIK).
To preserve your white color in a LUT3D you can use relative colorimetric OR you can choose as source profile an alternative version with your display profile 1931_2 XYZ white coords (for example a synth profile with sRGB primaries & TRC, but your custom white)

I’ll choose rel col because it’s easier, but YMMV and may want abs col with an alt source profile.

• This reply was modified 2 years, 10 months ago by Vincent.

[NoVoicemail]

thanks vincent

[Author]

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