How do I specify a background image for the captcha?

[eluser]Unknown[/eluser]
I want to change the default background image created by the captcha. How is it done? TIA

[eluser]abhinavp[/eluser]
You cannot change the background image of codeigniter's captcha. But you can control it by adjusting following values in capthca_helper.php:

Code:

$theta = 0;
        $thetac = 0;
        $radius = 0;
        $circles = 0;
        $points = 0;

All lines, circles on image are showing because of these values. I made them zero for my need.

Hope this will helps you.