Exposure

[Cyrille Berger]

> The exposure setting is only relevant to the 16-bit amd 32-bit floating
> point colour spaces, and the gamma correction they do too. They assume
> the pixel data is in linear rgb space with high dynamic range, which is
> the case for OpenEXR images. I don't know anything about the LMS colour
> space, but I would think you just need to ignore the exposure and the
> gamma correction.

ok then we need to disable the exposure settings when it's irrelevant in the 
overview of tab.

-- 
--- Cyrille Berger ---