[Digikam-users] Re: How to find pictures that are the same, except for rotation?

[Ben Staude]

Brute force method: write a script that makes three copies of each picture 
that are rotated 90/180/270. Now you can use some tool to "search for 
duplicates", or, if you're lucky and everybody in the chain used lossless 
rotation and didn't change anything else in the file, even md5sum might work.

Could be worth a try.

Ben

Am Freitag 17 Juni 2011 schrieb M. Fioretti:
> Greetings,
> 
> I'm a happy user of digiKam 1.9.0. I have recently added to my
> collection a LOT of picture folders I got from relatives and
> friends. I have realized that there are a lot of "duplicates"
> scattered around those folders, that I would like to remove.
> 
> The problem is that they are not really identical files, but rotated
> versions of the same original picture, without any other change or
> post processing, and sometimes they don't even have the same names...
> 
> For example, I may have 3 files called
> 
> P1919005.JPG
> P1919005bis.JPG
> marco.jpg
> 
> they're all jpg files generated by some digital camera that included
> standard exif tags, and only when you actually **look** at them and at
> their EXIF tags you realize that you only need to keep one of them,
> because one (but which one???) is the original as produced by the
> camera and the others are copies that were manually renamed/rotated
> later
> 
> So my question is, can digiKam help me to:
> 
> - find all pictures that are rotations of the same original
> - (ideally) remove all copies and keep only the original?
> 
> if not digikam, what would be another (Linux compatible) way to solve
> this problem? I have no problem to write shell scripts and/or use
> exiftools if there's no other way, but in this specific case I'd
> really appreciate some pointer in the right direction.
> 
> 	TIA,
> 	Marco