awtrobot reads incorrect colors

Question

I'm looking for a platform-independent way to read colors from the screen and simulate user input through mouse and keyboard actions. I have previously been using java.awt.robot, however some time in the past 2 years it has started reporting incorrect colors in OSX (other operating systems appear to get accurate colors) as noted in this question.

I'm looking for either a workaround for this bug or any other library/language which will provide this functionality.

Using the fairly simple code below can demonstrate the issue.

public void printColorAtCoordinate(int x, int y)
{
    Color color;
    color = robot.getPixelColor(x, y);
    System.out.println("RGB: " + Integer.toHexString(color.getRGB()));
}

It appears to get some colors correct, such as 0x000000, 0xffffff, 0x0000ff, 0xff0000 but not others such as 0x00ff00, which it reports as ff22ff00 (instead of ff00ff00). Most colors are off by at least a small amount.