[digikam] [Bug 341112] New: Removing Metadata from Batch Queue Manager modifies files

[vato]

https://bugs.kde.org/show_bug.cgi?id=341112

            Bug ID: 341112
           Summary: Removing Metadata from Batch Queue Manager modifies
                    files
           Product: digikam
           Version: 4.4.0
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Batch Queue Manager
          Assignee: [hidden email]
          Reporter: [hidden email]

Using the "Remove Metadata" tool from the Batch Queue Manager makes the files
lighter and thus less sharp.

Reproducible: Always

Steps to Reproduce:
1. Open a file with the Batch Queue Manager
2. Apply the Remove Metadata tool

Actual Results:  
Less sharp images

Expected Results:  
Images whose quality stays the same, but without metadata

Even if the queue is run only choosing the Remove Metadata tool without making
any selection (Exif, IPTC, XMP) the files become smaller and therefore lose
quality.

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=341112

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[hidden email]
            Summary|Removing Metadata from      |BQM Metadata Tool :
                   |Batch Queue Manager         |removing Metadata from
                   |modifies files              |Batch Queue Manager
                   |                            |modifies files

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[Jan Wolter-2]

https://bugs.kde.org/show_bug.cgi?id=341112

--- Comment #1 from Jan Wolter <[hidden email]> ---
I confirm the bug, but I am quite sure that it's independent from the used
Remove Metadata tool. The problem is that the jpeg quality settings from the
configure digiKam dialog are not applied in the BQM. To avoid the problem in
your BQ, you should add the convert to jpeg tool to the BQ and define the
quality settings manualy.
This issue was discussed some month ago in the mailing list:
http://mail.kde.org/pipermail/digikam-users/2014-August/019868.html
Furthermore, I think this bug is a duplicate of bug 338765

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[Andrew Goodbody]

https://bugs.kde.org/show_bug.cgi?id=341112

Andrew Goodbody <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[hidden email]

--- Comment #2 from Andrew Goodbody <[hidden email]> ---
Err, what? Remove metadata should do just that, the image data should not be
touched at all. Adding convert to JPEG and defining quality settings is only
going to make the problem worse.

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[Jan Wolter-2]

https://bugs.kde.org/show_bug.cgi?id=341112

--- Comment #3 from Jan Wolter <[hidden email]> ---
Andrew, you are right that the remove metadata tool does, what it should do:
removing the meta data.
But vato is also right that a BQ decreases the image quality, since the BQM
uses a fixed compression ratio for BQ processes. The expected result would be
that BQ uses the compression settings from Settings -> Configure digiKam ->
Saving Images. Up to now, thats not the case. Hence, to overcome the problem,
you should add the "Converto to jpeg" tool to the BQ.
Just as an example: When I add an jpeg file with size 7.9 MB to a BQ,
containing only the remove metadata tool, the processed image has only 2.8 MB.

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[vato]

https://bugs.kde.org/show_bug.cgi?id=341112

--- Comment #4 from vato <[hidden email]> ---
The question now is, why does BQM compress at all? If I use a jpeg file where I
only want to remove the metadata and nothing else BQM should not (re)compress
the image.

The "Remove Metadata" and "Apply Metadata Template" tools are very useful.
Please improve BQM so it does not compress images unnecessarily.

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[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=341112

[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|BatchQueueManager           |BatchQueueManager-Tool-Meta
                   |                            |data

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[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=341112

--- Comment #5 from [hidden email] ---
This file still valid using digiKam 5.0.0 ?

Gilles Caulier

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[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=341112

Maik Qualmann <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
   Version Fixed In|                            |5.1.0
         Resolution|---                         |FIXED
      Latest Commit|                            |http://commits.kde.org/digi
                   |                            |kam/496c5a0c341aaaf07e7a17e
                   |                            |09bf173bc4c2536aa

--- Comment #6 from Maik Qualmann <[hidden email]> ---
Git commit 496c5a0c341aaaf07e7a17e09bf173bc4c2536aa by Maik Qualmann.
Committed on 24/07/2016 at 05:48.
Pushed by mqualmann into branch 'master'.

if metadata tools are used alone in BQM, no image data is now changed
FIXED-IN: 5.1.0

M  +2    -1    NEWS
M  +33   -6    utilities/queuemanager/basetools/metadata/assigntemplate.cpp
M  +35   -8    utilities/queuemanager/basetools/metadata/removemetadata.cpp

http://commits.kde.org/digikam/496c5a0c341aaaf07e7a17e09bf173bc4c2536aa

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