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Arkadiy Demchenko avatar image
Arkadiy Demchenko asked ·

saturation model from photoshop or nuke

I used a lot of alRemapColor to desaturate things, but now I want to replace them with ai (a lot of them, so, with a script, without eyeballing the visual result). Desaturation with alRemapColor produces the same result as Nuke and Photoshop, but aiColorCorrect (as well as maya's remapHSV and colorCorrect) makes a very different result.

Is there a way to replicate the same desaturation effect as in Nuke/Photoshop with ai nodes?

color
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Arkadiy Demchenko answered ·

Ok, apparently alRemapColor uses Luminance mode "Rec709" in Nuke. The actual formula is available in Nuke SDK:

r*0.2125 + g*0.7154 + b*0.0721

Arnold's saturation is what's called "Maximum" mode in Nuke, but Arnold has "Luminance' mode in aiColorToFloat - that does exactly the same as the Rec709 formula above. So, mixing it with original node gives us Nuke's Rec709 Saturation.

Thanks me :)


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