[digiKam-users] Digikam, Tags and Raw files

[Matthieu]

Thanks Gilles

2018-07-29 17:10 GMT+12:00 Gilles Caulier <caulier.gilles at gmail.com>:

>
>
> 2018-07-29 5:56 GMT+02:00 Matthieu <ermelir at gmail.com>:
>
>> Dear all,
>>
>> I use Digikam for many years: this is a powerful tool which cover almost
>> all the features I expect from this kind of software; bugs are also quickly
>> fixed, new features are add very often.
>>
>> But unfortunately, since tags are not written in the RAW files, I spend
>> many time to manage my photo collection of 25k files: I have more than 66%
>> of my photos which are raw files, the 33 remaining % are shared in JPG, and
>> videos files.
>>
>> Yesterday, for an unknown reason, my tags tree crashed.
>>
>> I thought reloading tags from the metadatas stored in my files, but
>> because they are not written anymore in the RAW files, the only process I
>> have to restore my job is to do manually a second time.
>> Many months of job to redo.
>>
>> How to backup digikam is not the subject of this email :)
>>
>> I can understand that there are some risk to update RAW files.
>>
>> But I'm ready to take this risk for the following reasons:
>> - For the last 2 or 3 years I updated my RAW files with both Digikam
>> (when this feature was available), and with exiftool. I never encountered
>> any issue.
>> - I use Digikam to help me managing my photo collection, not as a tool to
>> view my picture collection: if I define a tag in a raw file in Digikam, I
>> expect being able to view this tag in a different software (rawtherapee,
>> lightraw, etc)
>> - Today, I have some differences between data stored in my RAW files
>> content, and the Digikam database.
>>
>> This is your product, with their own constraints. I use it as it because
>> it was helping me to earn time.
>> But sometimes, I need to find some workarounds to adapt it as the way I
>> manage my pictures.
>> Since this feature has been disabled, I was thinking editing correctly
>> all my files in Digikam, and then develop a software / plugin / shell
>> scripts / which would process the Digikam database and store the missing
>> tags with exiftool.
>>
>> The crash I got yesterday let me think differently...
>> So my question now: the checkbox to use the experimental feature to write
>> tags in raw files is unchecked since the 5.9 release (those one I use). If
>> I'm able to uncheck it in the sources files, will I be able to restore this
>> feature?
>>
>
> yes. return "true" to this method at line 144, and you will restore the
> feature :
>
> https://cgit.kde.org/digikam.git/tree/core/libs/dmetadata/
> metaengine.cpp#n144
>
>
>
>> Or did you also remove all the writing process behind when disabling this
>> feature?
>>
>>
> Code is not removed.
>
> In a better world, Exiv2 must have a check internally to see if current
> raw file processed is well supported at metadata writting process. In fact,
> to be right, Exiv2 must have a generic method to check is current type mime
> (and more info for file processed) are well supported at write process to
> prevent data corruption. As i know, this method do not exist yet.
>
> The method in DK source code is just a simple hack.
>
> Gilles Caulier
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/digikam-users/attachments/20180729/913d4cd7/attachment.html>