After spending the past two weeks dealing with color (tonemapping, gamma correction, blending, interpolation, etc) this is the conclusion I have come to.pic.twitter.com/ScuUGliPDe
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For the glTF-Sample-Viewer, bear in mind that it is for webgl, and doesn't support sRGB formats. So it gets sRGB "wrong", but it's the best it can do given the tech. In OpenGL/Vulkan, you should use sRGB formats and not do sRGBToLinear() conversion in the shader.
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More Tonemapping: Here is a desmos graph comparing some common tonemap ops. https://www.desmos.com/calculator/8rjrop48io … Additional tonemapping resources referenced in the above link.
