On Tue, Oct 5, 2010 at 4:37 AM, Rupert Weber <g...@leguanease.org> 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 ...
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