Hi,
To go back to the posterization topic that I quickly jumped on and so that we agree on what we are talking about, here is the Wikipedia definition:
Posterization or posterisation of an image entails the conversion of a continuous gradation of tone to several regions of fewer tones, with abrupt changes from one tone to another. This was originally done with photographic processes to create posters. It can now be done photographically or with digital image processing and may be deliberate or an unintended artifact of color quantization.
With that in mind, I took @ChrisBrejon’s lightsaber image which I think was not processed correctly:
ACEScg + sRGB ODT
Incorrectly Processed?
And then I extracted a cross-section because even if my eyes could not see posterization, maybe the analytical or scientific method if you want to call it like that would!
Well, I’m happy to announce that my old eyes are still in good shape!
And with a zoom on the red character region, just in case there is a trap:
Mostly noise from the render, nothing-to-see, moving on.
Cheers,
Thomas
Bonus Point: Here is the above signal quantized to 7-bit, i.e. posterized:
