Re: [Gimp-developer] Bug report in Levels control

On Thu, Aug 31, 2017 at 10:44 PM, Ben Hutchinson <benhut1 gmail com> wrote:

The Levels control (the dialog box you get with Ctrl+L) has a bug. When you
select Value for the channel, it is supposed to have a histogram which is
based on all of the color channels combined. However, this bug causes the
Value channel for the histogram to only consider the green channel. The
result is that when you select either Value or Green for the color channel,
you get identical histograms. The levels sliders themselves work correctly.
It's just the histogram that has the problem.

Early gimp (gimp-1.0.0 thru gimp-1.0.3 iirc) had some breakage on the red
channel.  You could start with a grayscale image, convert it to RGB and
using levels (at least, maybe other tools) change an image of blacks,
whites and grays to an image of reds.

Here is a tutorial that utilized this bug:

I suspect that it has always been this way.

Let me know if you file a bug report about it.  This is just great!


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