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

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

Bugzilla from 202020@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: [hidden email]
        ReportedBy: [hidden email]


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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[Bug 284625] Channel Mixer Preserve Luminosity does not work

Gilles Caulier-4
https://bugs.kde.org/show_bug.cgi?id=284625


Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
                 CC|                            |[hidden email]
          Component|Image Editor                |Channel Mixer
            Product|digikam                     |digikamimageplugins
     Ever Confirmed|0                           |1




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[Bug 284625] Channel Mixer Preserve Luminosity does not work

Gilles Caulier-4
In reply to this post by Bugzilla from 202020@gmx.net
https://bugs.kde.org/show_bug.cgi?id=284625





--- Comment #1 from Gilles Caulier <caulier gilles gmail com>  2011-10-29 08:25:38 ---
I confirm the dysfunction. Sound like "Preserve Luminosity" option do not have
any influence. Perhaps a signal/slot broken in GUI...

Gilles Caulier

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[Bug 284625] Channel Mixer Preserve Luminosity does not work

Gilles Caulier-4
In reply to this post by Bugzilla from 202020@gmx.net
https://bugs.kde.org/show_bug.cgi?id=284625





--- Comment #2 from Gilles Caulier <caulier gilles gmail com>  2011-10-29 21:03:24 ---
Note : Preserve luminosity work perfectly in Color mode. Dysfunction exist only
in Monochrome mode.

It's not a signal/slots connection problem.

Gilles Caulier

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[Bug 284625] Channel Mixer Preserve Luminosity does not work

Gilles Caulier-4
In reply to this post by Bugzilla from 202020@gmx.net
https://bugs.kde.org/show_bug.cgi?id=284625


Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




--- Comment #3 from Gilles Caulier <caulier gilles gmail com>  2011-10-29 21:56:49 ---
Git commit 223d431b8817d3791ce6bf87dfb5d4a716bc70af by Gilles Caulier.
Committed on 29/10/2011 at 23:55.
Pushed by cgilles into branch 'master'.

compute right monochrome gain to preserve luminosity when this one is required
BUGS: 284625

M  +12   -2    libs/dimg/filters/bw/mixerfilter.cpp

http://commits.kde.org/digikam/223d431b8817d3791ce6bf87dfb5d4a716bc70af

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[Bug 284625] Channel Mixer Preserve Luminosity does not work

Gilles Caulier-4
In reply to this post by Bugzilla from 202020@gmx.net
https://bugs.kde.org/show_bug.cgi?id=284625

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Version Fixed In|                            |2.3.0

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[digikam] [Bug 284625] Channel Mixer Preserve Luminosity does not work

bugzilla_noreply
In reply to this post by Bugzilla from 202020@gmx.net
https://bugs.kde.org/show_bug.cgi?id=284625

[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Channel Mixer               |Tool-Channels
            Product|digikamimageplugins         |digikam

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