[Bug 224047] New: Thumbnails incorrectly rotated on certain images

[Andrew Goodbody]

https://bugs.kde.org/show_bug.cgi?id=224047

           Summary: Thumbnails incorrectly rotated on certain images
           Product: digikam
           Version: 1.1.0
          Platform: Compiled Sources
        OS/Version: MS Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.1.0 (using Devel)
Compiler:          mingw4
OS:                MS Windows
Installed from:    Compiled sources

When I take a picture on my Nikon S6 in portrait orientation then the thumbnail
shown in digikam is rotated with respect to the actual image.
See http://www.elfringham.co.uk/DSCN1470_orig.JPG and
http://www.elfringham.co.uk/DSCN1470.JPG

The _orig file has the image in landscape, yet the thumbnail shows up as
portrait. The other file has the image in portrait yet the thumbnail shows up
as landscape.

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[Johannes Wienke-3]

https://bugs.kde.org/show_bug.cgi?id=224047





--- Comment #1 from Johannes Wienke <languitar semipol de>  2010-01-24 15:57:27 ---
I would really argue we should not depend on the kipi plugin for rotation but
instead use the lossless exif tag rotation whenever possible. This would
prevent a lot of these errors.

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=224047


Gilles Caulier <[hidden email]> changed:

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          Component|general                     |Thumbnails




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[Marcel Wiesweg]

https://bugs.kde.org/show_bug.cgi?id=224047


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--- Comment #2 from Marcel Wiesweg <marcel wiesweg gmx de>  2010-02-27 17:55:13 ---
I guess that the candlestick on the photo was upright in reality.
In _orig, the actual image (pixels on disk) are written in landscape mode. The
Nikon has a sensor and wrote the correct Exif orientation tag. Digikam will
rotate the image accordingly and show it correctly.

Now apparently, the second image was rotated with some tool so that the pixels
on disk changed were rearranged to portrait mode. At the same time, the Exif
tag was not reset, which means the image as shown by digikam is probably
rotated twice.

Now, with which tool did you rotate the image? Or what is the supposed bug
here?

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[Andrew Goodbody]

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--- Comment #3 from Andrew Goodbody <ajg02 elfringham co uk>  2010-02-28 14:22:55 ---
The bug is that in Album view, the thumbnail is shown rotated according to the
EXIF orientation flag, however if I double click the thumbnail to open the Full
Size Preview then the image is shown not rotated.
So just looking at the _orig file, in the Album view I see the candlestick
upright so the thumbnail has been rotated correctly. However in Full Size
Preview, the image has not been rotated and I see the candlestick with the top
on the left.

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[Marcel Wiesweg]

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--- Comment #4 from Marcel Wiesweg <marcel wiesweg gmx de>  2010-03-03 18:38:34 ---
I can reproduce this: In icon view, click to view preview. Close again, the
click to open editor. Now in editor, the image is exif-rotated one additional
time.

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[Marcel Wiesweg]

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--- Comment #5 from Marcel Wiesweg <marcel wiesweg gmx de>  2010-03-03 18:51:01 ---
SVN commit 1098429 by mwiesweg:

Do not exif-rotate a second time in editor - previews are rotated in the cache,
and in the case of full-size preview of a JPEG, this data will be reused
for the image editor.

CCBUG: 228869

 M  +6 -1      dimginterface.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1098429

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[Marcel Wiesweg]

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--- Comment #6 from Marcel Wiesweg <marcel wiesweg gmx de>  2010-03-03 18:57:49 ---
This is fixed. More I cannot reproduce currently, especially the preview was
always correct for me. Anyone confirming?

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[Andrew Goodbody]

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--- Comment #7 from Andrew Goodbody <ajg02 elfringham co uk>  2010-03-04 00:10:48 ---
Created an attachment (id=41305)
 --> (http://bugs.kde.org/attachment.cgi?id=41305)
Screen grab showing bug for me

Here is a screen grab showing the bug for me. I just updated to HEAD and
rebuilt digikam before doing this.

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[Marcel Wiesweg]

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--- Comment #8 from Marcel Wiesweg <marcel wiesweg gmx de>  2010-04-19 20:37:26 ---
I have now re-downloaded the DSCN1470_orig.JPG from the link above, regenerated
the thumbnail and viewed the full-sized preview. Still, the candlestick is
upright for me, I cannot reproduce the problem.

Can someone else try as well on Windows and Linux?

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["Jens Müller"]

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--- Comment #9 from Jens Mueller <tschenser gmx de>  2010-04-19 22:29:16 ---
For me also DSCN1470_orig.JPG thumb is shoing in portrait mode. The thumb from
DSCN1470.JPG is showing in landscape mode. Verified on Linux/Kubuntu.

Jens

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[Andrew Goodbody]

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--- Comment #10 from Andrew Goodbody <ajg02 elfringham co uk>  2010-09-30 23:34:18 ---
OK I just upgraded to svnHEAD and found the tick box for 'Show
images/thumbnails rotated according to orientation tag' was not ticked.
Selecting this and the behaviour is now correct. I guess I just missed this
before, but I am not sure that the behaviour was correct for the non-ticked
state even so.

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[Marcel Wiesweg]

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Marcel Wiesweg <[hidden email]> changed:

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




--- Comment #11 from Marcel Wiesweg <marcel wiesweg gmx de>  2011-01-21 14:32:19 ---
Exif rotation defaults to true in any case now. Closing as worksforyou.

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[Gilles Caulier-4]

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   Version Fixed In|                            |1.8.0

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