[ptx] Display gamma (was:Vignetting correction in nona)

[Bruno Postle]

On Mon 02-Jan-2006 at 10:33 +0100, pablo.dangelo at informatik.uni-ulm.de wrote:
>
> Gamma correction prior to the remapping. This is similar to the 
> gamma value supported by PTStitcher.

When stitching some 16bit images derived from RAW photos, I had real 
trouble picking control points because the images appeared so dark.  
Hugin could use a gamma-slider purely for GUI display purposes, this 
would be independent of anything that happened within the stitching 
engine.

-- 
Bruno