> These three applications seem to have substantial overlap, not all of
> which makes sense to me.
>
> E.g. The image editor has access to the right hand sidepanel, and can
> be used to tag pictures -- but there isn't a way to see tags.
The image editor is part of digikam, an extra main window like the light table or the camera ui. It's the image editing facility of digikam. It cannot exist on its own.
> Showfoto has access to tagging info, and a browser much like digikam.
Showfoto has no access to tags, ratings, comments, as it is not based on digikam's database. It's an image viewer and editor. It's there because it's easy to do reusing the image editor code. You do not need to use it at all if you use digikam.
>
> What is the rationale behind so much duplication between these three
> programs?
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