Comparing filmic color science v5/v6

[kofa (István Kovács)]

@rvietor

• filmic doesn’t cause a hue shift in highlights (as designed!) and
• there are situations were you want or even expect such a hue shift (psychologically)

Are you sure about the filmic doesn’t cause a hue shift bit? I don’t know colour spaces, unfortunately, but LCh’s ‘h’ seems to change. See Comparing filmic color science v5/v6 - #59 by kofa.

And someone has mentioned an effect, which describes the ‘visual’ hue shift (humans seeing bright, saturated colours with hue shifts) – the name escapes me, I’m afraid.

Edit: I’ve found it:

Problem with sunset colours

Just a note that perception of real-life sunsets may be affected by the Bezold-Brücke shift - red hues shift toward yellow when the intensity increases. On the other hand, a computer display probably isn’t bright enough to reproduce the effect.

I think the ‘sensors’ in our eyes, and the processing pathways (the internal ‘working colour space’ of the brain) can be saturated just like camera sensors and how the computer’s colour spaces can have out-of-gamut colours. And/or the original image may have too much red, due to infrared (though I believe cameras have filters fitted to avoid that – maybe when shooting such extreme heat, they are not sufficient?).

Anyway, I’ve tried introducing a gradual reduction of red (a parametric mask on exposure, merging only the R channel), but got horrible results, whether I did it before of after input color profile:

Before input color profile:

After:

Besides the ‘rat piss yellow’, we have green as well.