wxPython help please

[Jive Dadson]

I hope someone can help me with a couple of wxPython questions, or point 
me to the right newsgroup for the questions.

I am trying to modify the floatcanvas demo program.  I want to load an 
image from a file (jpg or whatever), then do a kind of color-picker 
action on it.

I haven't tried yet to figure out how to load the file.  Just for 
starters, when I click on the canvas, I want to get the rgb pixel value 
for the point under the cursor.  I can't for the life of me figure out 
how to do it.  I suppose it begins with event.GetPosition(), but after 
that I am at a loss.

The larger question is how to use wxPython.  It's got such fabulous 
stuff, but every time I try to do anything with it, I eventually give up 
  because I can't find adequate documentation.  I know very little about 
graphics programming.

Please respond here.  Because of spammers, the email address is fake.

Thanks,
"Jive"