Hey,
Long time user of ArgyllCMS here. Nothing else comes close, so thanks
for the great tools!
Given the prominence of the BT.2100 PQ (Perceptual Quantizer) standard
in HDR displays and mastering, is it planned to add PQ as a supported
gamma type for `dispcal`?
In principle, the only major difference to the existing curves like
`-gs` or `-g709` is that the response is compared against an absolute
scale, rather than a relative scale. That is, a PQ value of 0.5 (=512 on
a 10-bit output) must always be exactly 92 cd/m² - regardless of the
display's measured white point.
Thanks,
Niklas Haas
P.s. I'm not an expert on ICC profiles - but I wonder how HDR ICC
profile generation would be done. Given the fact that SDR ICC profiles
are normalized such that XYZ Y=1 maps to the display's maximum
brightness, it probably wouldn't be wise to do the same for HDR
displays. Instead, I'm thinking we could have Y=1 map to the “nominal”
white (i.e. a signal level of 520 for an ideal PQ display), and use
values above 1 to represent super-highlights. Would this also be
possible with ArgyllCMS?
