[Bug 151171] New: Need support for adjusting in HSV and HSL colorspaces

[Dik Takken-2]

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http://bugs.kde.org/show_bug.cgi?id=151171         
           Summary: Need support for adjusting in HSV and HSL colorspaces
           Product: digikamimageplugins
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: NEW
          Severity: wishlist
          Priority: NOR
         Component: Adjust Curves
        AssignedTo: digikam-devel kde org
        ReportedBy: d.h.j.takken xs4all nl


Version:           0.9.2 (using KDE KDE 3.5.7)
Installed from:    Gentoo Packages
OS:                Linux

The Adjust Curves plugin would be immensely more powerful when you can apply the curve on individual channels in the HSV and HSL color spaces. So, apart from R, G and B, there should be four additional channels: H, S, V and L.

Having both L and V is a key feature here, because HSL reduces saturation as you darken the image, while HSV increases saturation as you darken the image. In case you have a bright washed-out sky that needs adjusting, you adjust the V channel in HSV space. In case you have a dark lifeless foreground, you adjust the L channel in HSL space.

Having both a color space dropdown menu and a channel dropdown menu would be even better.

http://www.normankoren.com/light_color.html
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