[Digikam-devel] [digikam] [Bug 344155] Rotating raw image sometimes results in the preview showing the photo rotated in the opposite direction [patch]

Gilles Caulier caulier.gilles at gmail.com
Sat Feb 21 17:35:16 GMT 2015


--- Comment #2 from Gilles Caulier <caulier.gilles at gmail.com> ---

I'm not sure if your patch is fine about Raw preview rotation support.

Some technical points about RAW :

1/ Raw are mostly TIFF/EP files with private data. RAW are container of data
(images + metadata)
2/ Preview in RAW are typically reduced JPEG generated by camera.
3/ Raw image has dedicated metadata. This include Exif orientaion flag.
4/ Preview Image has dedicated metadata also, with another orientation flag.
5/ When you rotate image in camera (while image review on screen), you change
orientation flag of preview image, NOT RAW orientation flag.

So, if possible to have an non homogeneous orientation flags in RAW files. This
give strange results in digiKam.

I can reproduce the dysfunction with my Sony A77, as explained before.


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