Objective: In doing this lab you will learn about nested loops and teh processin

Question

Objective: In doing this lab you will learn about nested loops and teh processing of images.

Specification: Add a subtract method to the Compositor class shown below. This method takes two images of type BufferedImage as arguments and returns a new image, which is also of type BufferedImage. The pixels in the returned image are the difference of the pixels in the input images. Suppose that (r1, g1, b1) and (r2, g2, b2) are the red, green, and blue components of a pixel with coordinates (x, y) in the imput images. Then a pixel in the output image at the same location has component values (r1-r2, g1-g2, b1-b2). Any negative component values should be set to 0. Write a class with a main method that tests this method for any two images of your choice. Is the result of subtracting the first image from the second the same as the result of subtracting the second from the first? Test this as well.

The Compositor class:

import java.awt.*;
import java.awt.image.BufferedImage;
public class Compositor {
static final int MAX_VALUE = 255;
// this method returns a new image created by adding
// the source image image2 from the source image image1
public BufferedImage add(BufferedImage image1, BufferedImage image2) {
int width = Math.min(image1.getWidth(), image2.getWidth());
int height = Math.min(image1.getHeight(), image2.getHeight());

// create a new BufferedImage called image3
BufferedImage image3 = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
// get the samples of the pixel at (x, y) in image1
int colorValue1 = image1.getRGB(x, y);
Color pixelColor1 = new Color(colorValue1);
int red1 = pixelColor1.getRed() ;
int green1 = pixelColor1.getGreen() ;
int blue1 = pixelColor1.getBlue();

// get the samples of the pixel at (x, y) in image2
int colorValue2 = image2.getRGB(x, y);
Color pixelColor2 = new Color(colorValue2);
int red2 = pixelColor2.getRed() ;
int green2 = pixelColor2.getGreen() ;
int blue2 = pixelColor2.getBlue();

// find the sum of the samples to create a new color
int red3 = Math.min(red2 + red1, MAX_VALUE);
int green3 = Math.min(green2 + green1, MAX_VALUE);
int blue3 = Math.min(blue2 + blue1, MAX_VALUE);

// set the color of a pixel in image3
Color newPixelColor = new Color(red3, green3, blue3);
int newRgbvalue = newPixelColor.getRGB();
image3.setRGB(x, y, newRgbvalue);
}
}
// returns a reference to the new image
return image3;
}

// main method to test the add method
public static void main(String[] args) {
DrawingKit dk = new DrawingKit("Compositor", 1000, 1000);
BufferedImage p1 = dk.loadPicture("image1.jpg");
BufferedImage p2 = dk.loadPicture("image2.jpg");
Compositor c = new Compositor();
BufferedImage p3 = c.add(p1,p2);
dk.drawPicture(p3, 0, 100);
}

Explanation / Answer

import java.awt.*; import java.awt.image.BufferedImage; public class Compositor { static final int MIN_VALUE = 0; public BufferedImage sub(BufferedImage image1, BufferedImage image2) { int width = Math.min(image1.getWidth(), image2.getWidth()); int height = Math.min(image1.getHeight(), image2.getHeight()); BufferedImage image3 = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); for (int x = 0; x

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