Session name:
The name of the session variable where the extension save the text of the image created. To be safe the text cannot ne put inside the page form so the extension generate a random text and save the value in a session. When you must validate the form you must compare the value of this session with the value of the form field.
Image width:
The width of the generated image
Image height
The height of the generated image
Code length:
The length of the random text in number of characters
Chars type:
Create codes using this word list
Perturbation:
How much to distort image, higher = more distortion.
Bg Color:
The background color of the generated image
Bg image:
The background image of the generated image
Text angle:
The minimum and maximun angle in degrees, with 0 degrees being left-to-right reading text.
Higher values represent a counter-clockwise rotation.
For example, a value of 90 would result in bottom-to-top reading text.
This value along with maximum angle distance do not need to be very high with perturbation
Lines:
Draw vertical and horizontal lines on the image over text.
Lines color:
Color of lines drawn over text
Show reload:
If checked show an icone to reload the image and change the security code
Show sound:
If checked show an icone to play the code (only english language)
Font colors:
The text colors to use for drawing characters
* Make sure this contrasts well with the background color or image.