An option to have a manually fixed range histogram

[anadodik]

It would be useful to be able to manually fix the minimum and maximum values for the histogram.

That way, you would be able to directly compare the histogram values when flip back-and-forth between two images. Otherwise, if one histogram is stretched on one side (due to an error for example), the only option is to compare the images using one of the error metrics, which gives us a histogram of the error values.

[Tom94]

That certainly sounds like a good feature to have; I'll see what I can do when I get around it! :)