Customized OpenCart Captcha library
* File system/library/captcha.php should be replaced
* Background images should be in JPG and must be located in /images/capcha/*.jpg
* Names of images should be auto incremented like: 1.jpg, 2.jpg and so on.
* The font file should be located in the same folder
* You can control the size of the capcha (by the size of background)

Demo in Contact Form:
http://opencart.workshop200.com/nicefeatured/index.php?route=information/contact
Demo in Review Form:
http://opencart.workshop200.com/nicefeatured/index.php?route=product/product&path=20&product_id=46

Feel free to rate it :)