Human perception

I tried to take these concepts into account by using Ciecam (Color Appearance Model), since 2012…and now with Cam16.
With my interpretation :“Trying to take into account by software, the physiological aspects due to the perception of the eye and the brain”.

Some of the effects taken into account:
https://rawpedia.rawtherapee.com/CIECAM02#About_CIECAM02
Simultaneous contrast, Hunt’s effect, Steven’s effect, Helmholtz-Kohlrausch’s effect, Chromatic adaptation, etc.

An example taken from the list:

You can get an overview of what Ciecam is with the tutorial (which should probably be updated a little)
https://rawpedia.rawtherapee.com/CIECAM02

I recently made several tutorials on the subject (directly or indirectly)
https://discuss.pixls.us/t/paris-olympic-games-pont-alexandre-iii-tutorial/41895
https://discuss.pixls.us/t/another-tutorial-color-appearance-truck-under-a-tunnel/41947
https://discuss.pixls.us/t/scene-reffered-and-display-reffered-part-1/42076
https://discuss.pixls.us/t/scene-reffered-and-display-reffered-part-2/42087
The 3rd part, the summary will soon be available.

Concretely there are 2 modules present in Rawtherapee:

  • Color Appearance & Lighting (Advanced tab) - complete module which is complex for a beginner
  • Color Appearance (Cam16 & JzCzHz) (Local Tab) - in Basic mode, this module is quite simple and allows you to address (and solve) general colorimetry problems, including for high dynamic images (25 Ev)

Jacques

3 Likes