[Bug 274631] New: Applying free rotation to image produces white pixels in some areas which should be near black

https://bugs.kde.org/show_bug.cgi?id=274631

           Summary: Applying free rotation to image produces white pixels
                    in some areas which should be near black
           Product: digikam
           Version: 1.8.0
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Image Editor
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.8.0 (using KDE 4.6.0)
OS:                Linux

I import images in jpeg format and in editing use free-rotate to adjust
alignment. However, in the past couple of weeks this has been producing
splatterings of white pixels in areas which should be near black. I have needed
to  use other applications such as Gimp or Showfoto as a workaround

Reproducible: Sometimes

Steps to Reproduce:
Rotate photo with very dark and light areas. Only rotating 1-3 degrees

Actual Results:  
Speckled white areas appear where object should be at its darkest - eg brown
leather settee suddenly has white areas where dark seems should be.

Expected Results:  
I expected simple rotation and cropping without the introduction of white
pixels in areas which should be dark

OS: Linux (i686) release 2.6.37.6-0.5-desktop
Compiler: gcc

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--- Comment #1 from  <tcarthy blueyonder co uk>  2011-05-31 20:39:13 ---
Created an attachment (id=60526)
 --> (http://bugs.kde.org/attachment.cgi?id=60526)
photo of child playing near a brown leather sofa - see speckles along sofa

The phot has been rotated, producing the speckled effect in darker areas

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=274631


Gilles Caulier <[hidden email]> changed:

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--- Comment #2 from Gilles Caulier <caulier gilles gmail com>  2011-06-08 14:10:31 ---
i cannot see any speckled effect on your rotated photo...

Gilles Caulier

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--- Comment #3 from  <tcarthy blueyonder co uk>  2011-06-08 21:21:27 ---
Gilles

I see your point. The speckled effect appears when in edit mode but I see it
is not there when I look in view mode. Most disconcerting. This did not happen
when editing other photos a couple of weeks prior.

On Wednesday 08 Jun 2011 13:10:32 Gilles Caulier wrote:

> https://bugs.kde.org/show_bug.cgi?id=274631
>
>
> Gilles Caulier <[hidden email]> changed:
>
>            What    |Removed                     |Added
> ---------------------------------------------------------------------------
> - CC|                            |[hidden email]
>
>
>
>
> --- Comment #2 from Gilles Caulier <caulier gilles gmail com>  2011-06-08
> 14:10:31 --- i cannot see any speckled effect on your rotated photo...
>
> Gilles Caulier

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--- Comment #4 from Gilles Caulier <caulier gilles gmail com>  2011-06-08 23:18:16 ---
Can you take a look of image editor in the situation ?

Do you have enable under/over exposed indicators ?

Gilles Caulier

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--- Comment #5 from  <tcarthy blueyonder co uk>  2011-06-09 20:01:08 ---
Giles

Thank you for that insight. I never realized there was such a setting. I
notice that the highlighting seems to show after rotation, usually. I changed
the colour to red and then unticked the indicator. So that' me told.

Thanks again.

Trevor
On Wednesday 08 Jun 2011 22:18:17 Gilles Caulier wrote:

> https://bugs.kde.org/show_bug.cgi?id=274631
>
>
>
>
>
> --- Comment #4 from Gilles Caulier <caulier gilles gmail com>  2011-06-08
> 23:18:16 --- Can you take a look of image editor in the situation ?
>
> Do you have enable under/over exposed indicators ?
>
> Gilles Caulier

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID




--- Comment #6 from Gilles Caulier <caulier gilles gmail com>  2011-06-09 20:07:41 ---
On the bottom/right corner of editor, in status bar, you will see 3 push
buttons. Two of these are used to turn on/off over/under exposure indicators.
The 3rd is used to switch color management.

Gilles Caulier

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--- Comment #7 from Gilles Caulier <caulier gilles gmail com>  2011-06-29 06:53:18 ---
*** Bug 267467 has been marked as a duplicate of this bug. ***

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