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Find similar picture?
Posted: Tue Feb 14, 2023 9:59 am
by alee001
Comparing the metadata, I don’t know why I have to be adjusted to 40% to find that they are similar (same)?
XnView MP Windows
Version 1.4.2 64bits (Jan 23 2023)
Re: Find similar picture?
Posted: Tue Feb 14, 2023 12:02 pm
by masterjp
I can not read your language in the meta data (EXIF informations), but the DPI Value should be different (300x300 DPI and 140,xx DPI).
Higher DPI Values stands for higher picture size. The picture size in pixel is equal, but the print quality is very different.
So the 40% similar search percentage must be much smaller.
Re: Find similar picture?
Posted: Tue Feb 14, 2023 1:03 pm
by alee001
masterjp wrote: Tue Feb 14, 2023 12:02 pm
I can not read your language in the meta data (EXIF informations), but the DPI Value should be different (300x300 DPI and 140,xx DPI).
Higher DPI Values stands for higher picture size. The picture size in pixel is equal, but the print quality is very different.
So the 40% similar search percentage must be much smaller.
Sorry, I change the language and revise the pictures to compare.
Re: Find similar picture?
Posted: Tue Feb 14, 2023 2:52 pm
by Scannia
I think, the Estimated Quality the reason. The left picture Quality is 99% and the right picture is 100%. The left picture contains lot of JPG artifacts and which is why it is perceived as different.
Re: Find similar picture?
Posted: Tue Feb 14, 2023 3:17 pm
by alee001
Scannia wrote: Tue Feb 14, 2023 2:52 pm
I think, the Estimated Quality the reason. The left picture Quality is 99% and the right picture is 100%. The left picture contains lot of JPG artifacts and which is why it is perceived as different.
Is there a problem with the algorithm, and their similarity is only 36%?!
Re: Find similar picture?
Posted: Tue Feb 14, 2023 4:25 pm
by Scannia
Yeah, maybe the algorithm too strict.
Re: Find similar picture?
Posted: Tue Feb 14, 2023 6:21 pm
by masterjp
Thank you. English screenshots are easy to understand.
I do not know the algorithm of XnviewMP for similar file search.
But there are many different ways to search for equal pictures.
Most of them convert the picture to a smaller picture max 64 x 64 pixel for comparing.
Then they check the used colors or other properties.
If you want to try other programs for comparing, you can try Alldup (Freeware),
which can handle pictures, music, etc.
It has different powerful technics to search for similar picture files.
The software support different languages: english, chinese, etc.
https://www.alldup.de/en_download_alldup.php
Re: Find similar picture?
Posted: Wed Feb 15, 2023 2:37 am
by alee001
masterjp wrote: Tue Feb 14, 2023 6:21 pm
Thank you. English screenshots are easy to understand.
I do not know the algorithm of XnviewMP for similar file search.
But there are many different ways to search for equal pictures.
Most of them convert the picture to a smaller picture max 64 x 64 pixel for comparing.
Then they check the used colors or other properties.
If you want to try other programs for comparing, you can try Alldup (Freeware),
which can handle pictures, music, etc.
It has different powerful technics to search for similar picture files.
The software support different languages: english, chinese, etc.
https://www.alldup.de/en_download_alldup.php
Thank you for your suggestion. I have also used other freeware to search for similar pictures, and the results are more than 90% accurate.
I use this feature a lot, and I hope the next version will improve it.
Re: Find similar picture?
Posted: Wed Feb 15, 2023 4:38 pm
by masterjp
Alldub is an interesting alternative program for searching, because it use a database for searching duplicate pictures.
It will save much time, if you often check the same picture folders and you have a few new files.
That is great.
Re: Find similar picture?
Posted: Wed Feb 15, 2023 9:39 pm
by winnylinny
alee001 wrote: Tue Feb 14, 2023 3:17 pm
Is there a problem with the algorithm, and their similarity is only 36%?!
Your screenshot shows
another image that is being compared to the "reference" image. So that's why it might be claiming "36% similarity".
Perhaps XnViewMP is incorrectly using the
not selected image to present 36%?
Re: Find similar picture?
Posted: Thu Feb 16, 2023 8:24 am
by alee001
masterjp wrote: Wed Feb 15, 2023 4:38 pm
Alldub is an interesting alternative program for searching, because it use a database for searching duplicate pictures.
It will save much time, if you often check the same picture folders and you have a few new files.
That is great.
I understand the benefits of a database, but that also means it creates equally large volumes of data.