Gamma slider adjustments don't work in unbounded mode sRGB:
http://ninedegreesbelow.com/gimpgit/unbounded-srgb-levels-gamma-slider.html
If gamma slider adjustments don't work, then Curves will also fail, even
if it's possible to make Curves work on unbounded data without clipping.
The suggestion was made that compressing the data to fit within the
bounded range 0.0 to 1.0, performing an editing operation, then
uncompressing back to the original range, might solve the problem of
operations failing in the unbounded mode sRGB color space.
Unfortunately compressing before doing a gamma slider adjustment,
followed by uncompressing, produces entirely different results than
doing the gamma slider adjustment on the uncompressed data in the first
place: x^a is not equal to ((x+y)^a - y).
A solution to the problem of gamma slider adjustments not working in
unbounded mode sRGB is to use the chromaticities of the source color
space to make a linear gamma color space in which to do Gamma slider
adjustments.
Elle
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