Digikam

Useful settings

Collections -> Ignored Directories -> #recycle (for synology)

Metatdata -> Behaviour -> Use Lazy Synchornization: makes you confirm the changes before writing them below. Useful when working on lots of pictures (eg face recognition)

Metatdata -> Behaviour -> Face tags + geolocation information on

Metadata -> Sidecars -> write and read on.

Miscellaneous -> Behaviour -> Scan for new items at startup, fast scan, detect faces in newly added images

Miscellaneous -> Behaviour -> Initially select the first item in the album

Faces

In the preview you can select show face tags on and off in the top left of the preview picture

To remove a face, right click on a picture, remove tag and then select the person to remove

You can make a face a thumbnail by rightclicking on a face in the People tab

You can see all the faces of a person in the people tab. You can see the whole picture in the Tags tab under People

To no longer scan for a person, you can right click the persn in the People view, click Unmark tag as face, continue, but BE CAREFUL do NOT remove the tag corresponding to this face tag from the images! (so answer NO) You will then be able to find the tag still in the Tags list, but no longer in the people view.