ADDITIONAL SYSTEM INFORMATION :
macOS 10.13.5, tested with Java 1.8, 10.0.1 and 11-ea.

A DESCRIPTION OF THE PROBLEM :
I am using macOS 10.13.5 on a Macbook pro 2015. In my application I am using the Robot class to take a screenshot of a part of the screen. When I display the BufferedImage it ist blurred/unsharp and does not correspond to the original image. Screenshots taken with other (not JAVA) applications do not show this problem.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Use Robot.createScreenCapture on an Retina display under macOS, and display the buffered image. Here are three images which display the problem: https://schrell.de/java-bug

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
a one to one image
ACTUAL -
a blurred image which is not identical to the original screen

---------- BEGIN SOURCE ----------
import java.awt.AWTException;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Test extends JFrame {

    private static final long serialVersionUID = 1802199483736051124L;

    public static void main(final String[] args) throws AWTException {
        final Robot robot = new Robot();
        final BufferedImage bufferedImage = robot.createScreenCapture(new Rectangle(0, 0, 200, 200));
        final JFrame imFrame = new Test();
        imFrame.add(new JLabel(new ImageIcon(bufferedImage)));
        imFrame.setSize(bufferedImage.getWidth() + 50,
                bufferedImage.getHeight() + 50);
        imFrame.pack();
        imFrame.setVisible(true);

    }
}
---------- END SOURCE ----------

FREQUENCY : always