Re: [Gimp-developer] Some blend modes break in unbounded mode sRGB

On 04/13/2014 11:26 AM, Gez wrote:
El dom, 13-04-2014 a las 00:45 +0200, Øyvind Kolås escribió:

I think that what Elle is asking is about the RGB operations that break
with ubounded sRGB chromaticity values. Several operations don't seem to
be suitable for chromaticity values beyond the 0,1 range.

Yes, some operations break because they weren't designed to work with RGB values less than 0 or greater than 1.

But even if the image is clipped to the sRGB color gamut such that no RGB values are less than 0 or greater than 1, forcing the conversion to sRGB rearranges the channel data radically, depending on the source color space and also the image color gamut. Consequently fundamental editing operations like Channel Mixer and channel blending no longer work as expected.

And even if the image is clipped to the sRGB color gamut, the results of divide, multiply, lighten only, darken only, hue, saturation, color, value, etc are altered by the conversion, and not in a good way.


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