exif orientation

hello :-)

I just hit a problem. Not so minor.

there are two setup about orientation in digikam (1.0)
* rotate the image according to the exifs
* change the orientation if image is rotated (should say: manually)

(I'm french, I don't know the exact english text)

Problem is: if you don't see the image with the bas orientation, you
can't rotate it manually and so you have no way to know the
orientation is not the good one.

I just uploaded gigabits of images just to notice I don't see them
online like they should be :-(

there should be, at least, a third option: rotate *and* fix the exifs.
Was this not the default before? I never noticed that

thanks for you work

jdd
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http://valerie.dodin.org
http://news.opensuse.org/2009/04/13/people-of-opensuse-jean-daniel-dodin/

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[Marcel Wiesweg]

> I just hit a problem. Not so minor.
>
> there are two setup about orientation in digikam (1.0)
> * rotate the image according to the exifs
> * change the orientation if image is rotated (should say: manually)
>
> (I'm french, I don't know the exact english text)
>
> Problem is: if you don't see the image with the bas orientation, you
> can't rotate it manually and so you have no way to know the
> orientation is not the good one.
>
> I just uploaded gigabits of images just to notice I don't see them
> online like they should be :-(
>
> there should be, at least, a third option: rotate *and* fix the exifs.
> Was this not the default before? I never noticed that

So you uploaded your images to a place which does not know how to handle exif
orientation flags? Use "Auto Rotate/Flip Using Exif Information", which
rotates the actual image data according to the flag and then resets the flag
to Normal.
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Le 03/01/2010 20:40, Marcel Wiesweg a écrit :

> So you uploaded your images to a place which does not know how to handle exif
> orientation flags?

yes

 Use "Auto Rotate/Flip Using Exif Information", which
> rotates the actual image data according to the flag and then resets the flag
> to Normal.

yes, thanks, done locally. But I have to do this on the server also.

Do you happen to know the imagemagic syntax to do this? if not, don't
worry, I will find it tomorrow

thanks again
jdd

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http://valerie.dodin.org
http://news.opensuse.org/2009/04/13/people-of-opensuse-jean-daniel-dodin/

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[Milan Knížek]

jdd-gmane píše v Ne 03. 01. 2010 v 21:52 +0100:

> Do you happen to know the imagemagic syntax to do this? if not, don't
> worry, I will find it tomorrow

If your images are JPEGs, then you want to use jhead and jpegtran
instead of ImageMagick, to use a lossless rotation.

$ man jhead

ROTATION OPTIONS
       -autorot
              Using  the  'Orientation' tag of the Exif header,
              rotate the image so that it is upright.  The pro‐
              gram  jpegtran  is  used to perform the rotation.
              This program is present in most  Linux  distribu‐
              tions.   For  windows,  you need to get a copy of
              it.  After rotation, the orientation tag  of  the
              Exif  header  is set to '1' (normal orientation).
              The thumbnail is also rotated.  Other  fields  of
              the   Exif   header,   including  dimensions  are
              untouched,  but   the   JPEG   height/width   are
              adjusted.  This feature is especially useful with
              newer Canon cameras, that set the orientation tag
              automatically using a gravity sensor.

Regards,

Milan Knizek
knizek (dot) confy (at) volny (dot) cz
http://www.milan-knizek.net - About linux and photography (Czech
language only)

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Le 04/01/2010 08:36, Milan Knížek a écrit :

> If your images are JPEGs, then you want to use jhead and jpegtran
> instead of ImageMagick, to use a lossless rotation.

thanks :-)

jdd

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http://news.opensuse.org/2009/04/13/people-of-opensuse-jean-daniel-dodin/
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