[Bug 117115] New: Automatically rotate/flip using camera-provided information (EXIF) modifies image contents

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------- Additional Comments From ach mpe mpg de  2006-04-28 12:11 -------
Hi Roger,
this was discussed long ago.  At the end:

  o not all popular image viewers or all OS honour EXIF orientation
  o it's very confusing for 'newbie' users when image is once roated once not.
  o Play save and rotate contents

Please add a wishlist (if it does not exists) about a mode where
digikam consitently uses/modifies exif orientation instead of rotating the
images.  I'll add my vote.

Achim
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roger.larsson norran net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |wishlist



------- Additional Comments From roger.larsson norran net  2006-04-28 14:46 -------
I take back everything (almost)
since I noted that it is not konqueror that honors EXIF
but rather the camera (Canon) that stored a rotated thumbnail
in the file.

My new camera stores a thumbnail as taken orientation.
My new camera can also save original RAW (NEF) at the same
time as it stores high quality JPEGs.

I could settle with the following:

When first entering download dialog digikam starts a
wizard that asks the user if (s)he wants convenience
or uncompromised quality.

convenience: autorotate images, create a new directory
uncompromised: no autorotate, the camera file is unmodified.

Then add a note about that individual selections can be
made in the advanced settings.
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[Gilles Caulier]

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------- Additional Comments From caulier.gilles free fr  2006-05-16 16:58 -------
Please close this file and re-open a new one. The subject can be confuse with the title. When developpers check B.K.O, they read titles in first, not the all the files content  (:=)))...

Thanks in advance.

Gilles Caulier
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------- Additional Comments From mwieser gmx de  2006-05-16 17:36 -------
About lossles vs. not lossless:

Lossless rotation is lossless in a way that there is no recompression.
But the resulting image looks (very!!) slightly different to a image rotated within an image viewer. Calculating the difference between both is *not* the right thing to do! You should rotate the auto-rotated image by 270 degrees (e.g. with jpegtran, which is lossless) and compare the result with the not-rotated version. There will be no difference.

=> Digikam's autorotation makes the image slightly different to the non-rotated (original) version but neither version is better (or worse) than the other. That's just an effect of the Jpeg color subsampling and things like that.

So please do not remove this feature!
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[Marcel Wiesweg]

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------- Additional Comments From marcel.wiesweg gmx de  2006-05-16 22:34 -------
If noone objects I would like to close this bug. What Matthias pointed out (#22) is what I tried to say, that is, there is no information loss.
The last wish of Roger (#20) comes down to UI changes if I understand correctly.
There are too much different problems discussed here.
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[Gilles Caulier]

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------- Additional Comments From caulier.gilles free fr  2006-05-16 23:15 -------
Yes Roger,

I'm agree with the explaination of Marcel. Please close this file and open new one about gui improvements. Thanks in advance

Gilles Caulier
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[Gilles Caulier]

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caulier.gilles free fr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Camera GUI
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roger.larsson norran net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID



------- Additional Comments From roger.larsson norran net  2006-05-24 23:45 -------
#22 Is correct.
Read up a bit on jpegtran and noted that if the result is rotated back
you get the same image again - I have verified this too.

=> this bug report is now INVALID (provided that digikam uses jpegtran
routines for all operations), remaining is not even the wished UI
modifications. Well maybe a tooltip explaining this...
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