Find color at co-ord?

Ok, I'm completely to new to SCAR but as I know JAVA, its pretty easy to get the hang off and I know the basics.

So I need a line to find the color of the pixel at a particular co-ord...
Anytips on how to do so?

And incase you guys can suggest a more effecient way of doing this; what I want to do is:
While pixel (x,y) is color (red) then do this

 

Code:

program Test;
var
  color : Integer;
begin
  color := ClRed; //your color here
  While GetColor(X, Y) Do
    Writeln('Hello World!');
end.

Try looking at tutorials for help also if you want to go deeper: http://www.villavu.com/forum