[digiKam-users] Change Raw file orientation using metadata

[Nicolas Boulesteix]

Hi,
Indeed, that Digikam store or not the orientation flag in the metadata is,
may be, not the main thing, but, the fact you can't adjust orientation in
Digikam on a Raw (just to see it in the right orientation) and then
applying some change in the metadata and keeping this orientation is wrong
for me.

For this, orientation flag could write in the metadata, even if it is
inconsistent for raw file but Digikam should be able to read this flag
again only for displaying preview and thumbnail (and even if the DB is
lost), or it should be told to digikam to not update orientation from
metadata if some adjustement was made in the DB.


Le lun. 5 août 2019 à 12:42, Maik Qualmann <metzpinguin at gmail.com> a écrit :

> 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
>
>
>
>
>

-- 
Nicolas Boulesteix - Chasseur de Lueurs - http://www.photonoxx.fr
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