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Accurate. The 2.2 and various hacks compensate for the baked in hardware. Although perception is nonlinear, the nonlinearity here specifically addresses hardware on standard sRGB displays. After all, as cited above, why would you apply a nonlinear correction for perception when it has that baked in? What is missed by many, is that standard LCD technology, despite being inherently linear, has that low level hardware nonlinearity baked in. Typically, it is a flat 2.2 power function, although other displays or modes may use differing transfer functions. The irony is that the nonlinear 2.2 function adopted into most imaging results in a closer-to-linear signal, that ends up further nonlinear based on tonemapping, SMPTE2084, or other such nonlinear adjustments for technical or aesthetic reasons. In the case of raytracing, a mere 2.2 adjustment is woefully worthless. PS: The CIE1931 model, of which the RGB encoding model is effectively derived from, used visual energy. That is, it doesn't model "reality" so much as the psychophysical byproduct that happens in the brain. Luckily, the base model, XYZ, operates on a linear based model with some extremely nuanced caveats. Raytracing using RGB tristimulus models as a result, sort of work. |