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Anonymous Wed Feb 3 12:26:31 2021 No.799308 [View]
File: 467 KB, 1041x1041, 1586133877230.png [View same] [iqdb] [saucenao] [google]

>>799301
It's the reflectance value of what we perceive as middle gray. A typical target in photography for setting exposure. There is a chart here with a few values: https://en.wikipedia.org/wiki/Middle_gray.. I'm using 0.18 because it's what corresponds to 50% lightness in ACEScg.

Pic related has the background as ~0.184, although tonemapping renders everything slightly dark.

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