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

[pippin gimp org]

On Sun, Apr 13, 2014 at 06:18:08AM -0400, Elle Stone wrote:
> In the strongly color-managed world of BABL and GEGL, the only *RGB*
> color space/working is *s*RGB, either the linear gamma/light sRGB or
> the more perceptually uniform regular sRGB with its not quite
> gamma=2.2 TRC.

There is no linear gamma *or* perceptually uniform choice at import. There is a
conversion to one of the babl-managed pixel formats; and after that GEGL
operations are free to convert between any of the unbounded babl formats.

GIMP is making things more confusing by letting an arbitrary extra parameter
change the behavior of compositing ops; this "feature" is something I consider
a bug, it shouls also be considered bugs to do operation in linear space if the
algortihm of a GEGL op behaves incorrectly/really unexpectedly unless it works
in a more perceptual space.

> I've asked this question of what is actually meant by "color
> space/working space" in the world of BABL and GEGL twice before now,
> and no one has answered. But it's a pretty important point, so I'm
> asking again.
>
> Thanking you in advance for confirmation/clarification of what
> "color space/working space" means when discussing *BABL/GEGL* color
> spaces/working space,

Not sure if this is a clarification; I do not know what you mean by the terms
either and can only tell you what the intended architecture of GEGL is; for
better communication than what is possible by email please try IRC.

/pippin