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Generating Text Images on the Fly with ASP.NET
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Generating Text Images on the Fly with ASP.NET
http://www.asp101.com/articles/john/textimage/default.asp
know I promised that I wouldn't go into them, but one of my favorite uses of this type of thing is to tell human visitors to your web site apart from computer visitors (spiders). By generating an image with a text message, you can ask visitors to type in the text to verify that they're not a computer. Granted there are computer programs (OCR or optical character recognition programs) that can do this type of thing, but they're relatively complex to write and are pretty easily fooled by picking weird fonts or distorting the images slightly. Most of the bigger web service providers like those that provision free email accounts or free web space have already implemented something like this. For more info, check out the CAPTCHA Project. The 8 page technical report available from the site's home page makes for an interesting read if you're interested in the topic.
ASP.NET > Tips and Tutorials
Oct 10, 2006
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