[Digikam-devel] [Bug 144155] wrong(?) histogram y-axis when blown-out over/underexposure

[Arnd Baecker]

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http://bugs.kde.org/show_bug.cgi?id=144155         




------- Additional Comments From arnd.baecker web de  2007-04-13 00:50 -------
> >in digikam you would have to use logarithmic scale to see anything --but that's
> >not intuitive for photography work.
>
> Why it's not intuitive ? It work perfectly...


Well, while it works perfectly, there are many people
who are not familiar with logarithmic representations ;-)

So the histogram y-axis is surely not wrong
for over/underexposure, cutting off the upper part
of the histogramm looks like a good solution.

But how to determine the cut-off value?
Maybe
  cut_off = min( maximal_value_of_histogram, 2*vertical_variance)
or one determines the cut-off as
the largest maximum on the interval [0.1, 0.9] ?