![]() For things like albedo calculations, which are normalized 0.0 to 1.0 linear data typically, this is important and not terribly clear. ![]() The transfer function is the function that takes display referred nonlinear values to display linear values. Folks using nonlinear eight bit representations, and not citing the transfer function.Stop doing that! It is far better to start with a float value, and if necessary (yuck) convert to the eight bit representation. Folks using eight bit representations.So part of the problem here I would cite as: Not quite your target of 0.18 and those code values are quite fussy in that range. That would mean a value of 128, or more ideally expressed as 128/255 = 0.501960784313 which is display linear 0.215860500113224 via the sRGB OETF inversion. ![]() We aren’t sure here what that transfer function is, but we can make a guess to suggest it is the sRGB OETF. Remember that those are eight bit encoded values according to some transfer function. When I used those Grey Cards in Blender we just use a diffuse shader with a value of 128 128 128.
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