PHP General List,
With a little help from the web, and help from this list, I have a
simple CAPTCHA image that works within the content system I'm building.
But it's *really* simple. Basically white text on a black background,
with a couple of white lines to obscure the text a little.
I'm pretty sure that in its current state, my CAPTCHA image could be
cracked by OCR software from the 1950s.
So I'm hoping to take it up to the next level.
I might be able to figure out how to add more lines, more colours, and
those kind of basic changes.
But what I definitely can't comprehend is how some CAPTCHAs have that
really warped and distorted text.
Is that possible with PHP? Do I have to make a library of pre-warped
text images or something?
Is it possible to make backgrounds that are really crazy with textures
and gradients. Would that also rely on a pre-built library of images?
Can someone maybe point me to an online instructional on how to get a
CAPTCHA image that really works?
Tips on what differentiates a good CAPTCHA from a bad one would also be
really sweet.
Thank you for any advice.
--
Dave M G
Ubuntu Feisty 7.04
Kernel 2.6.20-15-386
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