PHash.org: the open source perceptual hash library

[ajju]

This can be uber useful for a lot of stuff. We developed something functionally very similar to detect image spam at my $employer a couple of years ago. Good stuff.

[pieter]

It's also GPL so if you base your application on it it'll have to have a very liberal license too.

[jws]

You'll have to use the restrictive GPL-3 or compatible licenses and be forbidden from using the more liberal licenses. All point of view.

(I wish software library people would put their licenses up front instead of making me download it to find them.)

[whughes]

It's not AGPL, though, so IIRC you can use it in any web apps you come up with without having to publish source.

[sho]

No updates for a year. Abandoned?

[nickb]

A year? 0.3 came out in Nov 08.