CAPTCHA background and text colours

Hi
A client of mine has complained a few times that the CAPTCHA background colour and text colour are too similar and the alphanumerals cannot be read.
How can i manipilate text and background colour?
Here is my code:
<cfimage action="captcha" height="50" width="180" text="#strCaptcha#" difficulty="low" fonts="verdana,arial,times new roman,courier" fontsize="20">
thank you
Delon

Been having the same issues with a couple of my clients...They are getting fairly irritated just trying to read the CAPTCHA, so I did some digging and came across this company located in Cali..Confident Technologies and they look like they are just getting started but seem to have a pretty good solution..I tried it and was impressed.

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