i-DeClone Returns 100% similarity on competely different TIFF images

[Mike707]

Hello,

Searching for duplicate photographs in different volumes, i-DeClone grouped various TIFF photographs together, with differences from 97% to various 100% similarity. I thought that was odd, because the names are different, and I know what the photos are about.

Fair enough, I opened them and they are absolutely different. I mean totally different. Different places, indoors/outdoors, people/no people etc.

Below is an example group results:

Code: Select all

Name		Size	Date modified		Group #		% Similar	
que_003_.tif	18.8 MB	03/12/2020 18:15	2		97	
que_009_.tif	17.7 MB	03/12/2020 18:17	2		100	
que_008_.tif	17.6 MB	03/12/2020 18:17	2		100	
que_007_.tif	17.6 MB	03/12/2020 18:16	2		100	
que_006_.tif	18.3 MB	03/12/2020 18:16	2		98	
que_005_.tif	17.6 MB	03/12/2020 18:16	2		98	
que_004_.tif	17.6 MB	03/12/2020 18:15	2		100	

I can eventually post a snippet of the photographs, if necessary.

I don't think i-DeClone uses a hash comparison to check for files that are 100% the same, but I checked just in case and, of course, they are completely different:

The only similarity is that all of these were scanned with the same scanner and at same settings, but I have hundreds of other photos scanned like this and that don't show up as duplicates when scanning their folders.

If I change the scan to find only 100% similarity and compare file contents, then indeed those files are not identified as duplicates.

Does that mean that, to be on the safe side, we should always compare the contents when seeking duplicates in photographs?

THanks

[nikos]

I tale it you are scanning for similar photos. The question is what kind of options did you use? Did you leave declone defaults or have you added your own criteria?

[Mike707]

Hello,

The photos are quite (or completely) different. Here's a sample: https://imgur.com/a/oD1sqME

• Blured sample of 6 photos. Sufficient to see how different they are.

• Selected settings

• Results

Maybe I'm picking the wrong settings, but I had initially gone for the default ones (in fact, I've never changed the settings until I realized this was happening with these photographs).

Thanks

[nikos]

I see the problem is your settings. First you should be searching for PHOTOS, not all files
then make sure that CONTENT is ticked in the advanced scan property page (that should be on by default if you ticked similarity search)
see here for more information: www.zabkat.com/declone/phone-remove-similar-photos.htm

[Mike707]

Hello,

OK, so when it comes to photographs (and other file types), the only way to really make a good comparison is by comparing the file contents. That makes sense.

Thanks a lot!