[Digikam-devel] [Bug 302946] New: Add 'colors' composite histogram to Adjust Curves tool

[Dik Takken]

https://bugs.kde.org/show_bug.cgi?id=302946

            Bug ID: 302946
          Severity: wishlist
           Version: 2.5.0
          Priority: NOR
          Assignee: digikam-devel at kde.org
           Summary: Add 'colors' composite histogram to Adjust Curves tool
    Classification: Unclassified
                OS: Linux
          Reporter: d.h.j.takken at xs4all.nl
          Hardware: Other
            Status: NEW
         Component: Image Editor
           Product: digikam

The histogram in the side panel of the editor features a very useful composite
view, which shows all three color components on top of each other.
Unfortunately, the Adjust Curves tool lacks this view.

When adjusting curves, it is critical to carefully watch the color channels,
because the lumunance histogram does not always show it when a specific channel
is damaged by truncating pixel values. You need to look at the color channel
histograms to see this. For this reason, I think a composite view is a very
important asset for the Adjust Curves tool.

Reproducible: Always

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