getPixelColour (x, y);
Gets the colour of the pixel at co-ordinates x, y in the current scene.
This function returns a stack with 3 elements. Each of the elements will be a number between 0 and 255 inclusive - the first representing how much red there is in the colour, the second how much green and the third how much blue.
NB: Because SLUDGE may scale the displayed image, these values may not match up exactly with the numbers you used to colour the pixel.
The Background Image
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