On Mon, 02 Jun 2003 18:28:42 +0200, Sven Neumann <[EMAIL PROTECTED]> wrote:
> Feczak Szabolcs <[EMAIL PROTECTED]> writes:
> > Changing the color balance/brightens-contrast/ color curves are
> > significantly slower in gimp vs. photoshop on the same machine.  The
> > problem is not the processing time alone, but the preview takes the
> > same amount of time as the final processing.  I have relized, that
> > gimp calculates all the data in preview mode as I would have pressed
> > the ok button.
> Very well spotted.
> [...]  The problem is
> indeed that the preview is implemented by doing the color
> transformation on the full-size image data. [...]
> > Other good idea came from my friend: creating a smaller image in
> > memory, which has the resolution of the screen and calculating the
> > preview on that image.
> That is obviously the approach that should be taken.

This is also the approach that is suggested in this enhancement proposal:

Should we add a "donate" button in Bugzilla?  :-)

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