Render the sky map image without assumed_gamma (linear).
Then in the scene where the image map is used put
assumed_gamma 1.

If both scenes are gamma corrected (assumed_gamma 1) then
gamma is applied twise to the image map. Same applies to
using photographs as image maps. Gamma correction should
be be removed by applying 1/gamma correction before using
them as image maps in scenes with assumed_gamma 1.

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Kari Kivisalo

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