what are these?

[alexandergre]

ok i know that these numbers are for security reasons but why they make it so dirty and not clear,obvious?
the image is from rapidshare.de

 

[Punk]

These images are used to stop bots from creating accounts to spam afterwards.

 

[UltraDude]

thats alot clearer then alot. Go and register an email account at hotmail and yahoo. You have to squint to actually make out what those numbers and letters say!

 

[gabbaii]

thats actually pretty clear compared to other sites.

 

[The_Beast]

thats alot clearer then alot. Go and register an email account at hotmail and yahoo. You have to squint to actually make out what those numbers and letters say!

thats actually pretty clear compared to other sites.

the ones on yahoo are really bad, they are blurry and the letter are at all different angles

 

[alexandergre]

That image is just an example.
ok, but does anyone know why they are so dirty?, there must be a reason.

 

[TFT]

Would it to be with the misuse of character recognition software, The dirtier it is the harder for software to recognize!!

 

[UltraDude]

Would it to be with the misuse of character recognition software, The dirtier it is the harder for software to recognize!!

yeah pretty much. Programs can now be used to scan images and the computer works out what letters they are. Thats why they have got more complicated and harder to read

 

[dhaynes]

Would it to be with the misuse of character recognition software, The dirtier it is the harder for software to recognize!!

It's called Captcha. Basically it's been put in place to prevent automated programs that spam and stuff. Read the Wikipedia article if you want to know more: http://en.wikipedia.org/wiki/Captcha