This ("lightness prediction") is one of the design criteria for the OKLAB color space, see: <a href="https://bottosson.github.io/posts/oklab/" rel="nofollow">https://bottosson.github.io/posts/oklab/</a><p>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.<p>This article by comparison is very grayscale-focussed and concise, but gives less information on the physics behind it.