Thanks a lot for the links (especially for the paper one).

Yesterday night, in response to this thread, I did some experiments trying to see whether there was a way of detecting where the speculars where but the method I found (and-ing together the areas with above threshold-1 luminosity and areas with below threshold-2 saturation) was too noisy to be of any use. The paper confirms that you need a much more sophisticated approach.

As usual, the best way to fix a problem is to prevent it so, if people stopped stupidly baking in reflections/highlights, they would provide better products with less work.

Bye.

P.S.: the 4 1.39 numbers look suspiciously similar to the inverses of the coefficients used to compute the Y component of the RGB->YUV transform. Maybe the idea behind the thing is to locate high luminosity regions and tone down the luminosity, keeping chroma info intact.

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