Re: Duplicate images

[Rich Gilson <signman359 gmail com>]

Of the options given, I would think that doing a "picture content checksum" would be best.  You can't rely on the EXIF data either because it is possible within F-Spot to change the date/time on a photo.

SignMan359

On Sun, 2007-09-23 at 16:50 +0200, Sébastien Barthélemy wrote:
> Le dimanche 23 septembre 2007 à 00:43 +0200, Lorenzo Milesi a écrit :
> > Bill Moseley ha scritto:
> > > Version: 0.3.5-0ubuntu2
> > >
> > >
> > > I have duplicate images in my collection that point to the same file.
> > > Is there a way to clean those out of the database?
> > >   
> > There is a bug lost somewhere in the time! :)
> > http://bugzilla.gnome.org/show_bug.cgi?id=169646
> > Ciao
>
> Hello
>
> I'm wondering what the checksum duplicate should/would cover.
>
> In the following scenario
> 1. I import some picture
> 2. I tag it, with "write metadata on file"
> 3. I re-import the initial picture by mistake.
>
> after the step 2, the file on disk changed, therefore, comparing the
> checksums at step 3  won't detect duplicate.
>
>
> This is indeed an argument in favour of a policy "never modify the
> picture".
>
> Another solution would be to store a checksum of the initial file.
>
> Yet another solution would to use a "picture content checksum",
> independant of the file, the resolution etc... (gqview can find
> duplicates according to a similarity measure, I don't know how this
> works)
>
> Another useful hint would be exif metadata, 2 pictures taken at the
> exact same time with the same camera may be duplicates.
>
>
> What do you think about this, will it be handled ?
>
> cheers
>
> SB
>
>
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