Not a DT expert.

MANY photo apps will have duplicate names.

There is usually good reason for this:
* Thumbnails are created, sometimes in multiple sizes.
* If there is some kind of album feature, these can be implemented as
folders of links (aliases) to the actual image.
* Some apps can/will duplicate an image before editing it.  For
non-destructive edits this amounts to duplicating the 'recipe'

***

Generally you don't want a zillion files in a single directory.  The
optimum number for speed varies by operating system, but it's a much
smaller number than most photo collections.  A few hundred to a few
thousand.

***

If you have extensions turned off (E.g. Img_0006.JPEG shows in your file
browser as Img_0006) then you can't tell the Raw from digital negative from
tiff, from jpeg.

***
AFAIK *NO* photo dam is robust against file changes happening outside of
the program.  You can use other tools to *search* for duplicates, but do
your removal inside the app. (This doesn't have to be.  Programs like
fswatch can monitor directory trees and report changes.  Clever code could
uses these changes to update the picture database, and reconnect side car
files.)



Regards

Sherwood



On Sat, 15 Feb 2020 at 13:49, Tobias Krause <[email protected]> wrote:

> Hi,
>
> I just started using darktbale - in the first step mainly as DAM tool
> trying to clean the mess of photos that have been spread over different
> devices, folder, ...
>
> First things first: darktable is amazing and after just using it fore
> some days I wonder how I could ever use something else. Thanks to all
> developers!
>
> Unfortunately quite some of the the photos are stored more than once and
> there is no "main" folder containing all images.
>
> Is there a way to find photos in the database which are the same by
> filename and date? Knowing a photo has a twin would make live easier
> when it comes to trashing duplicate files: trash all photos in a
> specific folder which have a duplicate in some other folder.
>
> Regards
> Tobias
>
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