https://bugs.kde.org/show_bug.cgi?id=493421
Kåre Särs <kare.s...@iki.fi> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REPORTED |RESOLVED
Resolution|--- |UPSTREAM
--- Comment #1 from Kåre Särs <kare.s...@iki.fi> ---
Thanks for the report.
I agree that it would be nice to have the preview updated when you modify the
brightness and contrast sliders. Unfortunately implementing that has some big
hurdles:
1) Brightness and contrast are implemented in the backends/drivers and not all
of of them implement those options.
2) Brightness and contrast are applied to the raw input and not the already
adjusted output, so the end result would be quite far off from the calculated
guess. I would not be surprised if some scanners even would adjust the
brightness of the lamp.
So the problem is basically that any image manipulation that we apply, would
not reflect the actual result that you get when then doing the real scan, so
the user would have to do a new preview anyways.
Sorry for not being able to fix the issue,
BR,
Kåre
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