Click here to see full post: http://blog.themeforest.net/tutorials/click-in-that-captcha/
Wow Jeff, this is brilliant. Love the concept!
Wow, this is too cool. Thank you for the mention at the beginning of the article. I love the idea of a click-able captcha, especially when its all PHP . Getting the pixel color at an x/y coordinate is brilliant.
Wow I really like this! Thanks for the tut.
Great concept, however, we must remember the red/green deficiency and other color recognition issues when using this.
Unfortunately while the concept itself is clever, the CAPTCHA is very trivial to break. So much so that I threw together a PHP script just for fun that submits fake spam to your script’s form every time it’s run.
If you’re interested in the source, you can find it here:
Neat concept, but obviously isn’t very accessible.