> To correctly composite two gamma-corrected images, the images
> should first be converted back to linear space, composited, then
> have gamma correction re-applied.
Indeed. However, I wasn't aware of the tremendous influence of using
an approximated or exact gamma value calculation. Look at the dark
image example given on that page in section `Assume a gamma of 2.2'.
A very nice side effect of reading that article is that you are
basically forced to set your monitor's gamma to the right value,
otherwise you can't see the test images correctly :-)
Werner
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