[Bug 146714] New: IE, showfoto, album view rotation: rotated TIFs are losing metadata about picture

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           Summary: IE, showfoto, album view rotation: rotated TIFs are
                    losing metadata about picture
           Product: digikam
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: Image Editor
        AssignedTo: digikam-devel kde org
        ReportedBy: mikmach wp pl


Version:            (using KDE Devel)
Installed from:    Compiled sources
Compiler:          gcc4.0.1
OS:                Linux

Very serious bug:

TIFs rotated in IE, showfoto, also rotated in album view (kipi-plugin?) are losing EXIF data about picture conditions: ISO, aperture, shutter speed, focus.

I think also author and caption can be lost.

Digikam 0.9.2svn ver. 673249
May be a problem with exiv2? (svn ver. 1109)

JPEGs seems unaffected by this bug.
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mikmach wp pl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Image Editor                |Metadata
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[Gilles Caulier-4]

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caulier.gilles gmail com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ahuggel gmx net



------- Additional Comments From caulier.gilles gmail com  2007-06-12 23:09 -------
Mik,

I know this problem with tiff and Exif.

This relevant of 2 issues :

1/ libtiff : this library is used to create/read tiff file. This library do not support Exif metadata (but XMP and IPTC yes). libtiff is used by JPEGLossLess kipi-plugin to perform rotation on non-jpeg files (via ImageMagick), and by image editor to save tiff file. There is an alternative to libtiff : opentiff library, but the license is not fully opensource if i remember...


2/ Exiv2 : this library is used by digiKam to handle all metadata. It do not support yet tiff file format in writting mode. This job is under developpement (Andreas work on it). I hope that it will available for future version of Exiv2.

Note TIFF file based include major RAW files format, like DNG, NEF, CR2, etc... witch will be normally available on writting mode in the future using Exiv2

Andreas, can you give us some fresh info about tiff writting mode support in Exiv2 ? Thanks in advance...

Gilles
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------- Additional Comments From mikmach wp pl  2007-07-02 18:17 -------
Well, this bug isn't exactly Digikam fault so should be closed. OTOH this is important thing and we shouln't lose this from our view. Leaving this as is.
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[Gilles Caulier-4]

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------- Additional Comments From caulier.gilles gmail com  2007-10-02 09:49 -------
Mik,

This file will be solved with digiKam for KDE4 witch support Xmp metadata. In Xmp, we can store in standard all standard Exif tags (not Makernotes, sorry)

I will implement a method to backport all current Exif info to Xmp (adns vis versa).

Gilles
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[Gilles Caulier-4]

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------- Additional Comments From caulier.gilles gmail com  2007-10-03 12:27 -------
SVN commit 720609 by cgilles:

digiKam from trunk (KDE4) : XMP metadata management with database.

This is the first stage to control XMP metadata contents with Database contents and vis versa. This code handle XMP with current Database schema witch still the same than 0.9.x.

Marcel work currently on the new databse schema describe on the OpenOffice document available at this url :

http://websvn.kde.org/trunk/extragear/graphics/digikam/DBSCHEMA.ODS?view=log

The code will be adapted later by Marcel to handle more XMP tags according with this new schema.

This is the list of current changes :

- Preparing code to handle strings hosted in different languages (comments for example, dixit B.K.O #98462).
- Handle all Xmp.exif and Xmp.tiff tags has Exif metadata content to get photo informations set by camera.
- Do not set Iptc.Urgency tag with Rating value, but use standard Xmp.Rating tags instead. Import of Iptc.Urgency
as Rating still running if Xmp metadata are not available. (B.K.O: 134206).
- Preparing code to handle Xmp strings set different authors(comments for example, dixit B.K.O #134476).
- Set the Tags name as Xmp.subject (keywords).
- Set the Copyright/Authors information in Xmp tags (schema inspired from Adobe Photoshop 7.0).
- Store Tags Path List into a dedicaced digiKam.org Xmp namespace as a sequence of strings. Do not use Iptc.Keywords for that. Import from Iptc still running if Xmp metadata is not available. This way is very important to restore properlly in database all tags assigned to an imported picture. There is not strings size limitation with Xmp and char encoding is always UTF-8. Nothing will be lost now.
- Xmp is always stored in pictures format witch support this metadata format : jpeg, png, and tiff.

All these changes require to update libkexiv2 and Exiv2 from trunk to compile and run digiKam properlly.

CCMAIL: digikam-devel kde org
CCMAIL: marcel.wiesweg gmx de

BUG: 134206
BUG: 149966

CCBUGS: 98462
CCBUGS: 132362
CCBUGS: 91811
CCBUGS: 134476
CCBUGS: 136260
CCBUGS: 146714




 M  +59 -44    digikam/metadatahub.cpp  
 M  +1 -1      libs/database/collectionscanner.cpp  
 M  +127 -71   libs/dmetadata/dmetadata.cpp  
 M  +5 -4      libs/dmetadata/dmetadata.h  


WebSVN link: http://websvn.kde.org/?view=rev&revision=720609
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