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

[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
-- 
Digital Citizenship online course: http://mfioretti.com/node/129

Because your civil rights and the quality of your life depend on how
software is used **around** you