[Digikam-devel] [Bug 289181] raw processor rotates images without Orientation EXIF tag

[_kfj at yahoo.com]

https://bugs.kde.org/show_bug.cgi?id=289181





--- Comment #8 from  <_kfj yahoo com>  2011-12-18 13:13:59 ---
Am 18.12.2011 10:19, schrieb Gilles Caulier:

> The problem is not with RAW converter. Look in metadata TIFF orientation tag is
> the same  than CR2. If you disable thumb autorotate option from digiKam/metadta
> config dialog, TIFF will not be rotated

this is not so, at least not on my system. AFAIKT the raw processor here 
ignores the 'Orientation' tag and rotates according to the 'Camera 
Orientation' tag. Please note that my problem is that the image IS 
rotated, but I want it NOT to be rotated, this is why I have set the 
'Orientation' tag to 'Horizontal'. And my issue is with the resulting 
TIFF file, not with the CR2 or it's display in digiKam.

In hugin-ptx, where I am discussing the issue, I've been told that there 
were versions of dcraw which exhibited this bug, so I suppose that's 
what my problem is here.

Of course it's possible that with your later version of the raw 
converter, the bug has been fixed already on your system.

> The problem is about RAW preview image where we don't have any relevant
> information about rotation angle. The real image rotation information is not
> the same. It'is issue,s a big puzzle.

the preview file will be rotated if autorotate is set in the camera, 
otherwise it's not. I've checked by extracting the embedded JPG with 
dcraw -e.

> The RAW preview is not taken from RAW data. It's an embedded JPEG image in RAW
> file. And orientation of this preview is not the same than RAW image, due to
> your change of your camera orientation settings.
>
> To solve this issue digiKam must be able to rotate thumbs independently of real
> image data. There is already a report in digiKam bugzilla about this subject...

my problem isn't with the embedded thumbnail images. I process the data 
with hugin to make panoramas and I have a pretty good idea how to tell 
rotated image data from unrotated data. I need all the image data as it 
hit the sensor. dcraw, DPP and raw therapee all perform as I expect on 
this system. digiKam does not. Be assured the problem exists and has 
nothing to do with thumbnails or digiKam's thumbnail display.

Kay

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