Here, my latest (and last for now) experiment with going from 
assumed_gamma 2.2 to assumed_gamma 1.0.

I used the adapted colour_map for the sky_sphere proposed by Alain 
Martel, and I changed all colours to srgb. Tweaked the light intensity 
and the colour_map intensity a bit to get what I think is a clean and 
correct image.

I also append a copy of my latest scene file with changes.

-- 
Thomas

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