[plt-scheme] How to get individual pixel in a bitmap image

Hi all,
I wonder how to access ti pixel in a bitmap image. I took a look at the
official documentation but when i emplement a bitmap% object and use the
"get-argb-pixels" it says me that the method is not known in this specific
object. How can i do???
Moreover i would like to print this image later.

Thanks a lot
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.racket-lang.org/users/archive/attachments/20061130/46f65338/attachment.html>