Fade.java in pgm

Fade.java

import java.awt.Color;

 public class Fade

{

             public static Color combine(Color c1, Color c2, double alpha)

    {

        int r = (int) (alpha * c1.getRed()   + (1 - alpha) * c2.getRed());

        int g = (int) (alpha * c1.getGreen() + (1 - alpha) * c2.getGreen());

        int b = (int) (alpha * c1.getBlue()  + (1 - alpha) * c2.getBlue());

        return new Color(r, g, b);

    }

    public static void main(String[] args)

            {

        int N = Integer.parseInt(args[0]);    

        Picture pic1 = new Picture(args[1]);  

        Picture pic2 = new Picture(args[2]);  

        int width  = pic1.width();

        int height = pic1.height();

        Picture pic = new Picture(width, height);

        for (int n = 0; n <= N; n++)

            {

            double alpha = 1.0 * n / N;

                 for (int i = 0; i < width; i++)

            {

                 for (int j = 0; j < height; j++)

            {

                    Color c1 = pic1.get(i, j);

                    Color c2 = pic2.get(i, j);

                    pic.set(i, j, combine(c2, c1, alpha));

                }

            }

            pic.show();

        }

    }

}