Re: [Gimp-developer] Configurable target selection by the "Auto" button on the Levels dialog

On Sun, 2015-06-14 at 19:05 -0300, Rodrigo Severo wrote:

The "Auto" button on the Levels dialog has a fixed behaviour today 
(which I don't know exactly which is).

The source code is available -- essentially it stretches contrast in 
each R, G, B channel separately. If you press Auto and then open as 
curves, you can see. The end points are, however, a few percent in 
from the ends, limiting its usefulness in a professional setting.

Its behaviour should be configurable by the user.
The point of it is that it "just works". An auto button should not be 

I think really what you are asking for is a "stretch contrast" filter 
that has configurable black and white points.

Note that you can already configure the black and white points in 
levels using the eye dropper.

The user interface for this functionality could be accessed by the 
user double clicking the "Auto" button.

That would be a "no" :-)  There aren't any other buttons that behave 
differently when you double-click on them (and actually for good 
reason, as no-one would ever guess it, and because it would mean every 
button would have to wait to see whether the user double-clicked 
before doing anything, giving a UI feeling of slowness.

I'm supportive of being able to set the levels/auto clipping 
percentage, perhaps in the Colours/Map/Stretch Contrast GEGL filter.


Liam R. E. Quin <liam holoweb net>

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