[digiKam-users] Change Raw file orientation using metadata

[Maik Qualmann]

A test with Darktable shows that it also does not store the orientation flag 
in the XMP file. Darktable creates a history that restores the rotation. But 
that is also incompatible with other programs.

Maik

Am Montag, 5. August 2019, 12:33:12 CEST schrieben Sie:
> It's true, "adjust exif orientation tag" write the orientation flag into the
> metadata. The behavior of both functions is inconsistent. Of course we can
> also allow the writing of the orientation flag on the rotation. I'll test
> how other programs (like Dartable) handle it. You have to understand that
> RAW files are very special. We usually get an aligned image from the RAW
> decoder. The thumbnail can be completely different aligned in the RAW.
> 
> Maik
> 
> Am Sonntag, 4. August 2019, 14:16:56 CEST schrieb Nicolas Boulesteix:
> > Finally, there's still something wrong as rotate a RAW is not persistent
> > if
> > done with rotate icon or rotate from item menu or shift+ctrl+left/right
> > shortcuts.
> > 
> > Using "ajust exif orientation tag" works, so, is there any chance the
> > rotate tool could be used with RAW to change the exif orientation tag
> > taking into account the initial value ? For example, applying a "left
> > rotate" on a picture with exit orientation tag set to "rotated to the
> > right", finally set the tag to "normal", or "rotate left" on a picture
> > with
> > "rotated to the left" tag result in a "rotated by 180°" value ?
> > 
> > Le dim. 4 août 2019 à 13:11, Maik Qualmann <metzpinguin at gmail.com> a écrit 
:
> > > This is the comment in the code that we do not apply the orientation
> > > metadata
> > > after rotation to a RAW file:
> > > 
> > > // Setting the rotation flag on Raws with embedded JPEG is a mess
> > > // Can apply to the RAW data, or to the embedded JPEG, or to both.
> > > 
> > > Maik
> > > 
> > > Am Sonntag, 4. August 2019, 12:46:48 CEST schrieb Nicolas Boulesteix:
> > > > Hi,
> > > > 
> > > > I just notice a matter when I rotate my RAW (fuji RAF) file in the
> > > > album
> > > > view with DK 6.2 (but 6.1 too).
> > > > 
> > > > In deed, I use shortcut  shift+ctrl+left or right to change
> > > > orientation
> > > 
> > > to
> > > 
> > > > the right or to the left. But if I change orientation this way, it
> > > > seems
> > > > nothing is written in metadata (in the sidecar) and if I change
> > > > another
> > > > metadata on the same file, for example if I just rate it, the
> > > > orientation
> > > > is reset and not as modified before rating.
> > > > 
> > > > If I use instead "ajust exif orientation tag", the problem doesn't
> > > 
> > > occur,
> > > 
> > > > rating the picture doesn't  reset orientation and the orientation tag
> > > > is
> > > > changed in metadata (in the sidecar file).
> > > > 
> > > > The matter doesn't occur with jpeg.
> > > > 
> > > > I don't know if there's some change, because I think, before, this
> > > > behaviour didn't occur, 6.1 seems to have the same behaviour but I
> > > > didn't
> > > > notice it yet. I try on my previous workstation which still have DK
> > > > 5.9,
> > > > and there's not this matter.
> > > > 
> > > > Digikam is set as follow in the metadata setting rotate tab :
> > > > 
> > > > X Rotate by oinly setting a flag
> > > > X Write flag to metadata if possible
> > > > X Show image/thumbnail rotated according to orientation tag
> > > > X Set orientation tag to normal after rotate/flip
> > > > 
> > > > Sidecar file are activated for readonly file.
> > > > 
> > > > I try to check/unckeck "set orientation tag to normal after
> > > > rotate/flip",
> > > > but it doesn't seem to change anything.
> > > > 
> > > > Any help is welcome
> > > > 
> > > > Nicolas