[Bug 307452] New: Corrupt preview images at 30 bit depth

[kdebug1]

https://bugs.kde.org/show_bug.cgi?id=307452

            Bug ID: 307452
          Severity: major
           Version: 2.9.0
          Priority: NOR
          Assignee: [hidden email]
           Summary: Corrupt preview images at 30 bit depth
    Classification: Unclassified
                OS: Linux
          Reporter: [hidden email]
          Hardware: openSUSE RPMs
            Status: UNCONFIRMED
         Component: Albums GUI
           Product: digikam

Using NVidia Card with 30 bit depth causes thumbnail images to be displayed in
corrupted colors.
Double clicking a thumbnail to enable the preview component shows correct
preview but the thumbnail line remains oddly colored

Reproducible: Always

Steps to Reproduce:
1. 30 bit depth desktop
2. start digikam
3.
Actual Results:  
see above

Expected Results:  
correct colors

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=307452

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[hidden email]

--- Comment #1 from Gilles Caulier <[hidden email]> ---
There is nothing relevant of screen device managed by digiKam. All is delegate
to Qt API and screen sub system, including NV driver...

I suspect a problem in NV driver in your case with Qt...

Note : if i understand well your report, only thumbnails are broken, not full
screen preview. Right ?

Gilles Caulier

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[kdebug1]

https://bugs.kde.org/show_bug.cgi?id=307452

--- Comment #2 from [hidden email] ---
Exactly. Thumbnails are broken, but the preview in the lower row is not.

Fullscreen is untested yet, will try it soon and report.

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=307452

--- Comment #3 from Gilles Caulier <[hidden email]> ---
Ca

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=307452

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Albums GUI                  |Thumbnails

--- Comment #4 from Gilles Caulier <[hidden email]> ---
Can you take a screenshot of thumbnail view ?

Can you provide a 30 bits sample image to test here ?

Gilles Caulier

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[Marcel Wiesweg]

https://bugs.kde.org/show_bug.cgi?id=307452

--- Comment #5 from Marcel Wiesweg <[hidden email]> ---
Gilles, this is about hardware capabilities, 10bits per channel:
http://forums.dpreview.com/forums/read.asp?forum=1004&message=40619494

We generate pixmaps from QImages, there is no other way, which only supports
8bit, and probably the whole traditional 2D X.org stack only support 8bit.

Digikam will not in the near future be based on SceneGraph, but OpenGL seems to
be the only way to access this bit depth.
http://stackoverflow.com/questions/6172514/display-monitors-with-more-than-256-shades-of-gray

For the bug here, I suspect a problem in the graphics stack.

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=307452

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DOWNSTREAM

--- Comment #6 from Gilles Caulier <[hidden email]> ---
Right Marcel,

So this bug cannot be resolved to digiKam. This problem must be reported in
another place, as video card driver company, or on X11 project if opensource
driver is used...

Gilles Caulier

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