PIH

[admin]

I see you have Content and Image ticked. That does not make much sense since Content dupes are logically always also Image dupes.

Thanks for that insight which it allows me to make my code faster: if Content is ticked then any check for Image dupes can be skipped for logical reasons.
a) if content differs we don't have to check for image since all Dupes filters are AND-ed
b) if content is same then image is same as well

Well, that was not 100% true. Ticking Image will remove any non-images from the results, so it does make a difference (though not by checking for image dupes, but by checking for file types which takes no measurable time).

[eil]

doesn't PIH is all about image dupes and can't be used for say mp3 dupes? so ticking Content and Image is so to say "must be" and logical for PIH use.)

[admin]

Exactly: Content + Image = identical file content AND image file