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[REBOL] Re: Preventing Automated Website Registrations

From: joel:neely:fedex at: 9-May-2002 16:30

Hi, Ted, Thaddeus Serpa wrote:
> I think a further twist could be to make different backgrounds for > each of the image files, both for same and different characters. > I was told that OCR filters can be used to decipher images. >
Another variation that I forgot to mention earlier was to make the character images with transparency, then place them in table cells with different background colors (using the hex codes). A separate piece of text could tell the visitor to e.g. ignore letters with red backgrounds. -jn-