Quote -  In general, assume everything is sRGB 2.2 unless stated otherwise. Your existing color textures are most probably gamma corrected to sRGB because a) that's what the file format standards are and b) the content creator used a monitor with a roughly 2.2 gamma curve.

With post-render gamma correction, I'd also use 2.2. That Mac vs Windows gamma is just a very vague rule of thumb; barely anyone's using a calibrated monitor anyway, so the actual gamma of the screen that it will eventually be looked at varies.

Stefan, guess what I'm finding on flickr.com? I'm finding equirectangular JPEG images that were originally HDR images. They are in linear color space, even though they are stored as JPEG, and I have to gamma correct them before rendering - otherwise they look stupid.

We can no longer talk about the JPEG as sRGB rule. People are abusing tools and techniques all over the place.

The only right answer is: Look at the image. If it is dark and oversaturated, then it is linear and you should not anti-gamma the image on the way in, even if it is a JPEG. If it looks normal, then it should be anti-gamma'd on the way in, even if it came from a .HDR or .EXR file. (I"m seeing these, too. Gamma corrected HDR images. LOL)

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)