Looks easier to read than most CAPTCHAS, though I suppose that you have to speak english to get past it. Could be a good way to learn a language :)
Has this stood up to any bot attacks yet? What's the significance of the image discoloration?
Has this stood up to any bot attacks yet? What's the significance of the image discoloration?
But don't throw the proverbial baby out with the metaphorical bath water! The literacy requirement may be an effective defense against the armies of human sweatshop CAPTCHA solvers that we hear about in the news.
Regarding attacks, would be attackers have more important targets for now. peoplesign isn't yet protecting any major sites.
peoplesign images have been recolored using a "secret sauce" algorithm. Recoloring one of two similar pictures reduces effectiveness of color histogram matching. It even reduces effectiveness of more sophisticated color profile matching techniques. In short, the recoloration is defense against a particular type of attack.