How do I create images that can be verified by humans only?

With the ever-growing number of automated spamming robots which tirelessly scour the Web, human-verification techniques are becoming an increasingly necessary part of the creation of web forms. The most common technique is the Completely Automated Public Turing Test to Tell Computers and Humans Apart—conveniently abbreviated to CAPTCHA—which presents the visitor with a word, or sequence of characters, in such a way that it’s hard for machines to decipher, but easy for a human being to read...

How do I create images that can be verified by humans only?

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