1. Display screen not global?

Hi
I've come across a bit of a problem.

Here's what I do.
I load a bitmap image from the disk- it shows on the
screen fine.
I jump to a procedure that draws on the screen, the image
still shows, but when I try to read the pixel values with get_pixel I
get nonsense values.
However, if I insert a display_image in my
procedure, then the get_pixel works fine, but now I have another
problem, the previous revisions of the screen are gone.

I can think of a number of ways around this, but - what's going on?
Does get-pixel read a sequence that is not global, rather than the
display screen?

Thanks for any advice
Bye
Martin

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