> But if I handle all kinds of light sources, it should be linear, right?

There are saturation issues if you use bright lights, you can end
up with pixels that are brighter than displayable, which washes out
the highlights. High Dynamic Range Images (HDRI) are not supported
in 3.61, though they are supported in MegaPOV. Also there are
gamma correction issues... a pixel that is half the value of another
pixel is not necessarily half the brightness, it's modified a bit by
hardware. You might try making a test pattern with some
gradient pigments to check the how linear the image gamma
appears with different assumed_gamma values.

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