The color of a pixel in Graphics

Hi... does anyone know how to get the Color of a specific pixel in a Graphics object??
For example:
public void paint(Graphics g) {
// Something like this would be great! (but it doesn't exist)
  Color c = g.getColor(10,10);
  /* etc... */
}Does anyone know something about it?

http://www.rgagnon.com/javadetails/java-0257.html

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