Luminance-absolute colorimetric rendering intent?
We have ICC-absolute colorimetric rendering intent which uses relative luminance. Would there be use for an absolute luminance variant of that?
Luminance-absolute colorimetric rendering intent would display encoded absolute luminance as display absolute luminance without adapting to the viewing environment. This would only be possible when both input and output image descriptions define absolute luminance. Otherwise it becomes identical to ICC-absolute colorimetric rendering intent.
Maybe this would be useful for critical viewing for content makers and mastering? You set up your viewing environment by a standard, use luminance-absolute colorimetric rendering intent, and tune your content to look good. That should allow one to choose the absolute luminance correctly for the content.
Or maybe this is unnecessary, because an application could use the output image description directly and do all this internally?