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Re:Conversion to Grayscale by myrmidon on Thursday September 05, 2024 @09:59AM (#41456711)
This ("lightness prediction") is one of the design criteria for the OKLAB color space, see: https://bottosson.github.io/posts/oklab/

The HSV color spectrum in the oklab article shows very clearly how the OKLAB lightness is a much better metric for whether a color is bright or not than HSV-value.

This article by comparison is very grayscale-focussed and concise, but gives less information on the physics behind it.

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