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In photography there is thing called 18% gray, which as far as I have understand is a color on a "gray card", which reflects 18% of the incoming light and when telling the camera to expose to it will somehow calibrate the exposure for you.

However let's say I have a plane with a material in Blender with e.g. a diffuse shader reflecting 18% of incoming light. And let's say I use standard view transform since filmic apparently does this automatically. When setting the exposure what value should the gray have to be properly exposed?

tempdev nova
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    The plane should have a diffuse shader at .18 r,g,b to set 18% reflectance. – Timaroberts May 26 '22 at 14:56
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    Also related https://blender.stackexchange.com/questions/101481/how-do-i-calibrate-exposure-to-match-a-gray-scale – Timaroberts May 26 '22 at 15:10
  • Related info https://blenderartists.org/t/whats-with-the-value-slider-in-the-hsv-tab-of-the-default-color-picker/1360186 (depending on how the different color-grading schemes Blender uses in different circumstances affects grayscale). There's also one similar here that I saw in the last few months, but I can't find it now. – KickAir8p May 26 '22 at 15:40
  • Here it is: https://blender.stackexchange.com/questions/258388/value-in-hsv-not-linear/258402#258402 – KickAir8p Jun 02 '22 at 17:59

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