The random string generator is too difficult to read

[narayan]

When a guest tries to search the site, he is presented with a graphic with 6-digit/letter string. He is supposed to read it and enter the letters/digits i9n the space provided.

While this system is designed to block automatic crawlers, it is too difficult to read! In most of the generated images, up to 3 digits/letters can be totally illegible to even human readers!

[bastik]

I didn't had problems with it as I was a guest, but I logged out to see what narayandescribed. Sometimes it's really difficult to read. Mostly I have to guess the letters.

4 digits/letters with stripes (swirls) and blur and space in the digits/letters is my suggestion.

[narayan]

And have some minimum color contrast (many letters get camouflaged in changing color shades and surrounding artwork)