XMP metadata manipulation

Add a new tag into existing subject tags in the .xmp sidecar:

exiv2 -M 'set Xmp.digiKam.TagsList my-new-tag'  mo xxx.JPG.xmp

exiv2 -M 'set Xmp.dc.subject my-new-tag'  mo xxx.JPG.xmp

 

Print specific tag:

exiv2 -g TagsList pr xxx.JPG.xmp
 

Digikam settings

  Set photos and db location on first start to ~/Pictures/digikam-photos
 Configure digikam:
 Metadata page:
    Behaviour:
        Write this information to the Metadata:
            Image tags
            Rating
            Pick label
        Reading and writing metadata:
            Update file modification timestamp when files are modified
            Rescan file when files are modified
    Sidecars:
        Read from sidecar files
        Write to sidecar files
            Write XMP sidecar only
    Rotation:
        Rotate by only setting a flag

Thoughts on photo/video files organizing

Directory structure pattern: "YYYY/YYYY-MM-DD-tag1-tag2/xxxxx.jpg"

Should the files be renamed on copying from the camera? If necessary rename only once -- before working with the files, importing them into darktable/digikam.

Do not use stars, flags, color labels, use text tags instead, store tags in .xmp files.

Use two tags like "edit" and "edit-TIMESTAMP" when tagging photos for a special temporary/one-time task like "print" and "print-20200109"... Keep those tags to track history.

Tag photos as "printed", "shared", "published", and with a the same word but with a timestamp "printed-20200109" etc. 

Tag photos to delete with "delete" tag, rather than using digikam's delete function.

Put videos into a subdirectory.

Mark for culling: 

Certain to keep: "pick-best" > "pick-good" > "pick-keep" 

Tentative: "pick-uncertain" > "pick-bad" > "pick-delete"

Organizing photo/video with rating

I use the following rating meaning in Shotwell:

 rejected = candidate for wastebin

 unrated = have not analyzed this photo yet

 1 = keep and return to reanalyze later and maybe then mark as 'rejected' or '2'

 2 = keep and forget

 3 = keep, needs editing

 4 = keep, do not publish -- this is original photo which was edited but saved as a diffenet image file (e.g. edited via external program and saved as IMG000_edit, so look for _edit image)

 5 = publish finished work: a) perfect out of the camera b) was edited (file has 'edited' suffix or tag)

 flagged = used to mark photos for immediate processing, work in progress

And the following workflow:

Folder tree:
YYYY/YYYY_MM_DD_tag1_tag2.../
    - video
        - edited
    - edited
       

1) Mark ranks, add tags.
2) Edit those marked with '3': mark 'flagged'
3) Export final image as '_edited', mark original as '4', clear flag.
4) Add '_edited' to Shotwell, mark as '5'.

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