Yes, the distorted letters, random colours and grainy background all help to confuse any bot that might try to parse the image and read the actual text.
Since the distortion and coalescing of individual letters sometimes makes the letters unreadable even to humans, it is customary (not to mention a good practice) to provide a "I can't read this... show another image" link to users. On Jul 20, 1:00 pm, Processor Devil <[email protected]> wrote: > Yeah, captcha is more secured... but you need to have special font and > colorful background > > 2009/7/20 Cerebrus <[email protected]> > > > > > > > It's a form of CAPTCHA... a more reliable method, IMO. > > > On Jul 18, 5:44 pm, Anand <[email protected]> wrote: > > > hi, > > > > if see some site like fields in registration > > > > * (Spam protection) What is the sum of 15 + 17? > > > > Human check > > > Some simple math 1+19 > > > > Why want to like this ?,if u know this- Hide quoted text - > > - Show quoted text -
