Bug 274631

Summary:	Applying free rotation to image produces white pixels in some areas which should be near black
Product:	[Applications] digikam	Reporter:	tcarthy
Component:	Plugin-Editor-Rotation	Assignee:	Digikam Developers <digikam-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	normal	CC:	caulier.gilles, edneymatias
Priority:	NOR
Version:	1.8.0
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed In:	7.6.0
Attachments:	photo of child playing near a brown leather sofa - see speckles along sofa

Description tcarthy 2011-05-31 20:32:16 UTC

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

Comment 1 tcarthy 2011-05-31 20:39:13 UTC

Created attachment 60526 [details]
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

Comment 2 caulier.gilles 2011-06-08 14:10:31 UTC

i cannot see any speckled effect on your rotated photo...

Gilles Caulier

Comment 3 tcarthy 2011-06-08 21:21:27 UTC

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 <caulier.gilles@gmail.com> changed:
> 
>            What    |Removed                     |Added
> ---------------------------------------------------------------------------
> - CC|                            |caulier.gilles@gmail.com
> 
> 
> 
> 
> --- 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

Comment 4 caulier.gilles 2011-06-08 23:18:16 UTC

Can you take a look of image editor in the situation ?

Do you have enable under/over exposed indicators ?

Gilles Caulier

Comment 5 tcarthy 2011-06-09 20:01:08 UTC

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

Comment 6 caulier.gilles 2011-06-09 20:07:41 UTC

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

Comment 7 caulier.gilles 2011-06-29 06:53:18 UTC

*** Bug 267467 has been marked as a duplicate of this bug. ***