[Digikam-devel] [Bug 304811] New: Offer a "stretch histogram" functionality to automatically adjust brightness & gamma

[Alain Knaff]

https://bugs.kde.org/show_bug.cgi?id=304811

            Bug ID: 304811
          Severity: wishlist
           Version: 1.4.0
          Priority: NOR
          Assignee: digikam-devel at kde.org
           Summary: Offer a "stretch histogram" functionality to
                    automatically adjust brightness & gamma
    Classification: Unclassified
                OS: Linux
          Reporter: kde at kde.lka.org.lu
          Hardware: Ubuntu Packages
            Status: UNCONFIRMED
         Component: BCG correction
           Product: digikamimageplugins

I've found that for lightening up a dark image, increasing the gamma value
works best.

However, that introduces a haze over the image (it looks as if it was slightly
foggy), and I've noticed that I can make the haze go away by decreasing
brightness and increasing contrast in such a way that the histogram curve
occupies the entire range. 

This also works to get the haze out of images that have it from the beginning.

However, this method takes some fiddling with the BC numbers/sliders to get
right.

Would it be possible to have a button or checkbox to make this happen
automatically?

Bonus points if the tool is batchable (with gamma adjustment as a parameter)

Or is there already a tool that does this naturally? (None of the
color->AutoCorrection seem to do much (except Equalize), and Equalize usually
spoils the colors completely).

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