This system generates a captcha image using a variety of fonts, colors, noise, shapes and lines. The system requires GD2 w/freetype support AND imagemagick.

After realizing that this may cause a problem for the colorblind or others with visual problems, I added the audio portion, which also now adds random noise to the samples.

An older version of this system is currently in use on the PartnerWeekly.com login and registration pages.