Chapter 7, Problem 23E

Explanation of Solution

Method “grayscale()” to convert the color image to black and white image:

import java.awt.Graphics;

import java.awt.Image;

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

//Definition of class Test

public class Test

{

    //Definition of main class

    public static void main(String[] args)

    {

        //Create an object for DrawingPanel

DrawingPanel drawpanel = new DrawingPanel(250, 250);

        //Create an object for Image

Image image = drawpanel.loadImage("Smiles.png");

        //Create an object for Graphics

        Graphics graph = drawpanel.getGraphics();

        //Set the panel

        graph.drawImage(image, 0, 0, drawpanel);

        //Call the method transpose

        grayscale(drawpanel);

    }

    //Definition of method grayscale   

    public static void grayscale(DrawingPanel panel)

    {

        //Create an array to store the pixels

        int[][] pixels = panel.getPixelsRGB();

        ////Traverse the width of the image

        for (int x = 0; x < panel...