Photo Visual Confirmation
: Adds a new kind of Visual Confirmation, also known as a CAPTCHA. The person presented with a confirmation prompt must look at photographs and determine if they fit in a certain category or not.
Requires the GD extension of PHP to be installed on the server. Some features require PHP 5; these will not be available on PHP 4, but the rest of the modification will work.
This is a phpBB 3 adaptation of Josh Yelon's Photo-Recognition Visual Confirmation for phpBB 2
. It adds a new kind of Visual Confirmation, also known as a CAPTCHA, to phpBB 3 forums. The person presented with a confirmation prompt must look at photographs and determine if they fit in a certain category or not.
Several default photographs (cats and cars) are included, but the real strength of this modification comes from the ability to replace the default pictures. All you have to do is upload some new ones and delete some of the old ones, and then you suddenly have a visual confirmation that is unique to your site.
I have expanded this from the phpBB 2 version with some new features. It integrates into all three of phpBB 3's captchas (registration, login, posting) and has ACP settings to control the number of pictures displayed on all three.
Demo screenshots of the ACP controls and the CAPTCHAs on login and registration can be found on the home page of the modification. (I can't provide direct links here due to hotlink protection, sorry.) The ACP screenshots are a little out of date, but they'll give you the general idea.