> > The Gimp uses logarithmic scaling, while other image processing tools I
> > know use another kind of scaling -- I thought linear, but sqrt has also
> > been suggested.

Sven Neumann writes:
> see also http://bugzilla.gnome.org/show_bug.cgi?id=72951. Would be
> nice to get this into 1.4 but we'd need a volunteer pretty soon now.

I took a stab at it, and attached a patch to the bug.  I only did
linear, but now that I know where the code goes, it would be trivial
to add sqrt or other scalings if anyone thought they would be useful.

My patch only affects the display of the histogram, not any calculations. 
Should it affect anything besides the display?

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