On Tue, Oct 5, 2010 at 4:37 AM, Rupert Weber <gimp@xxxxxxxxxxxxxx> wrote: > On 10/04/2010 04:17 AM, David Gowers (kampu) wrote: > >> Try making a flat region of color #2a7e23, selecting Pencil tool, >> choosing Color mode and a large brush, and painting #11e500 repeatedly >> over the same area. >> [...] >> In general, you can manifest this bug by picking a dark color, >> making a region of it, and painting over with a HSV value-increased >> version of same color. >> Ideally, this would possibly change Hue or Chromaticity, but shouldn't >> change Lightness significantly. Looking at the LCH color selector, L >> rises ~2 points for each paint application in my example. > > Unfortunately, that's not fixable but a result of the too small gamut of > the sRGB working space. > Combining the lightness of #2a7e23 with hue/saturation of #11e500 > results in (linear) sRGB values which are negative for red and blue. > Clipping those to 0-255 yields the result you observed (the color > becomes lighter than it should be). > > Whenever you observe this misbehavior, at least one of the resulting RGB > components should be at 0 or 255 -- otherwise it really would be a bug. Thanks for responding promptly, Rupert. In that case it really is a bug. Neither the input colors or output colors contain 255. The output color series is: 008700 008d00 009300 009800 009d00 00a200 00a700 00ab00 00af00 00b300 00b600 ... _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
