Re: [Gimp-developer] Three questions about opening an image and converting it to linear light RGB

[Nicolas Robidoux <nicolas robidoux gmail com>]

Some operations are made worse if you don't allow out of "gamut" values
(e.g. blacker than black and whiter than white).

The first example that comes to mind is convolutions that are implemented
in a separable way and that have negative coefficients.

I vaguely remember something about resampling with a transparency channel
too (which is done correctly in ImageMagick; there is a thread where I
question this and then "approve" in the ImageMagick forums).

So: If your operation is made worse by out of "gamut" values, clamp them
first thing.