The Captcha Dilema

I noticed that some people realy have nothing better to do than scrape website contact forms, comment forms on blogs like this one and submit spam all day to them.
WordPress has a few plug-ins to screen spam comments, we personally use Akismet. Which got me thinking on the Captcha images you see on forms that require you to retype the shown letters/numbers.
So i decided to look up some coding for it. mainly php.
This site has a easy to install and use script, and i did install it on a contact form.
To generate a random letter/number image, php has to use a graphics library like GD or Imagik.
For me, its like using up unessecary CPU.
So i kind of modified the script a bit to just get the random number/letter sequence, and just print it out in type face. Do away with the image processing.
View Code