Notice in my last two that the ground and the tube top do not change color. They both have shaders with no images in them. So image gamma is not a factor for them - just render gamma. Both of them have colors that are correct no matter what as they have no images involved.

Comparing my fox #3 and #4 in a flip test, you see the blue texture changing - nothing else.

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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)