>> Images and colours that you see on your monitor (eg in picture viewer, 
>> colour picker, or on the web) are not in linear colour space, they have 
>> already been gamma corrected.
>
> (Well, to be /exact/, they /are/ in linear color space (or should be), 
> because the display hardware's gamma and the gamma pre-correction cancel 
> out; after all, that's what the pre-correction is for ;-))

I meant the actual image and colour data itself, like what is stored in a 
jpeg file, or when you set the fill colour to (220,120,64) in a graphics 
program.  All those values you are used to seeing and probably "knowing" 
have already had gamma correction applied to them, you cannot just use them 
directly in POV without undoing the implied gamma correction first.

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