[Digikam-devel] [Bug 284625] New: Channel Mixer Preserve Luminosity does not work

[202020 at gmx.net]

https://bugs.kde.org/show_bug.cgi?id=284625

           Summary: Channel Mixer Preserve Luminosity does not work
           Product: digikam
           Version: 2.1.1
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Image Editor
        AssignedTo: digikam-devel at kde.org
        ReportedBy: 202020 at gmx.net


Version:           2.1.1 (using KDE 4.7.1) 
OS:                Linux

start showfoto
load color image
select channel mixer, tick monochrome, tick preserve luminosity
move any of the sliders red, green or blue to another value than default
parts of the image gets underexposed (clipping) or overexposed (clipping), i.e.
luminosity is NOT preserved.




Reproducible: Always

Steps to Reproduce:
load color image
select channel mixer, tick monochrome, tick preserve luminosity
move any of the sliders red, green or blue to another value than default

Actual Results:  
parts of the image are underexposed (clipping) or overexposed (clipping), i.e.
luminosity is NOT preserved.

Expected Results:  
No under- or overexposure.

Last version known to me where this not happened is digikam/showfoto 1.1.0

Quite annoying as I extensively use showfoto for professional photography.

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