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by Tizabet
Sat Mar 28, 2009 10:30 pm
Forum: [3.0.x] MODs in Development
Topic: [Beta] CASPER - phpBB3 Drop-in CAPTCHA mod.
Replies: 40
Views: 5771

Re: [Beta] CASPER - phpBB3 Drop-in CAPTCHA mod.

Xor the image with itself shifted one pixel to the side. Then assume black for each pixel that's touching ANY black. (ie: in photoshop, filters>other>minimum with 1px)

Sorry.

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