Hello Andrea!

On Thu, Apr 2, 2009 at 1:57 AM, Andrea Olivotto
<and...@andreaolivotto.com> wrote:
> Hi all,
> I'm a photo amateur, and I do like gimp. I posted some time ago some
> hints to make gimp more useful for photo retouch, and some have been
> done in 2.6.
> At this time, gimp seems to me that need speed. It is far away from
> Photoshop and other commercial softwares, and things are getting worse
> using GEGL (as I tried in 2.7 development program): I checked in Windows
> and in Ubuntu 8.10, AMD 3000+/64 plus 1GB RAM.
GEGL *is* what we are doing to increase performance. It's true that
currently GEGL is much slower, however, the previous GIMP architecture
was incapable of the optimizations and storage strategies required for
particularly large images, and also was very limited (no support for
higher bit depths, no automatic colorspace conversion so that any
image can be used as input to any operation).
Chances are that GEGL is already better at managing graphics than GIMP ever was.
It still needs quite a bit of work, but in my understanding, the
slowness is caused by the way GEGL is being used by GIMP. It could be
a lot better; and by the time GEGL is really well integrated, we could
reasonably expect far better responsiveness and comparable real speed,
with the possibility of vast speed increases for certain kinds of

> When I use curves, preview is redrawed very slowly, I can see the
> "blocks" under updating.
Things like Curves could certainly be done much quicker. A lot of
conversion goes on during the calculation; but really, for applying to
8bit and 16-bit pictures, a lookup table should be all that is needed,
with only a very little amount of conversion work that happens as soon
as the curve is adjusted. This means that currently, GIMP is making
GEGL do much more work than it needs to really do. These issues will
be settled as GIMP developers learn more about using GEGL, GEGL
matures, and as GEGL becomes better integrated in GIMP.

> I know that GIMP is open source, and developers don't want to compete
> with Photoshop (or Photoshop Express, or Paint Shop PRO, ...), but this
> is the real world in photo retouching. I just want to be honest, end to
> emphasize this issue.

I hope I've addressed your concerns.

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