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Night tonemapping and Geometric mean of luminance
newpolaris
2018. 5. 17. 12:25
https://www.cs.utah.edu/~shirley/papers/nighttone.pdf
https://mynameismjp.wordpress.com/2010/04/30/a-closer-look-at-tone-mapping/
Geometric mean of luminance: this is pretty much the exact approach outlined in Reinhard’s paper, where the geometric mean (log average) of scene luminance is calculated and used to scale the luminance of each pixel. With this approach a “key value” is user-controlled, and is meant to be chosen based on whether the scene is “high-key” (bright, low contrast) or “low-key” (dark, high contrast).