On Thu, 03 Sep 2009 17:54:17 +0200, Warp <war### [at] tagpovrayorg> wrote:
> Fredrik Eriksson <fe79}--at--{yahoo}--dot--{com> wrote:
>> Which is exactly what you should get if you use a gamma-aware image
>> format, regardless of what you set File_Gamma to.
>
>   No, because gamma correction will change the actual values of the
> pixels before they are used/displayed. Thus, for example, a pixel which
> in the image file has values <0.5, 0.5, 0.5> will be converted to
> <0.73, 0.73, 0.73> before being displayed on screen, for a gamma  
> correction value of 2.2.

When used as input, the pixel with the (gamma-corrected) value <0.73,  
0.73, 0.73> will be converted back to <0.5, 0.5, 0.5> *if you use a  
gamma-aware image format*.



-- 
FE

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