Am Mittwoch, 3. Dezember 2014, 23:16:35 schrieb johannes hanika: > On Wed, Dec 3, 2014 at 1:42 PM, Steven Fosdick <[email protected]> > > wrote: > > On 29 November 2014 at 15:06, johannes hanika <[email protected]> wrote: > >> your data is in xmp as a backup and to allow transferring it along with > >> the file easily. the database is our primary source of data, and used for > >> fast access (the collect module allows you to do fancy things based on > >> metadata, which would be atrociously slow if we would need to open all > >> the > >> xmp for this). > >> > >> you can sync the xmp data on startup with a crawler thread (which you can > >> enable in your preferences), in case you're doing crazy things to your > >> xmp > >> outside dt (load with other application, use sed, etc). > > > > If so this make it a better idea to change the database? Will darktable > > rewrite the XMP files from the database? It would be very simple to > > change > > metadata across a large number of files with SQL. > > yes, that would work. you might want to collect `film roll %', press ctrl-a > and write xmp in the right panel after that operation, to be sure the xmp > is written. xmp are only synced if data is changed inside dt (which is > pretty much all the time you work with a picture, star ratings, tags, > colour labels, enter/exit darkroom mode even without changes..).
Instead of forcing a write of all XMP files the crawler could be used again. Just set the field image.write_timestamp to 0 for every image you change in the database. If the crawler is activated (duh) it will detect that the XMP is newer than the db entry for that image and allow you to overwrite the XMP. That way only the images you actually changed needs to be handled. > -jo Tobias
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