RedGreenBlueFromGrayscale

/* RedGreenBlue
 * <Description>
 * Converts image to greyscale and red,green,blue variants
 * <Usage>
 * % javac RedGreenBlue.java Luminance.java Picture.java
 *
 * % java RedGreenBlue mandrill.jpg
 * //YIELDS 4 different picture objects
 *
 * <References>
 * http://introcs.cs.princeton.edu/java/31datatype/Luminance.java
 * http://introcs.cs.princeton.edu/java/31datatype/Picture.java
 * http://programmersheaven.com/discussion/360618/how-to-make-java-wait
 * @author
 * Dan Latham
 * <[email protected]>
 *
 * @version 0.0.1
 *
 */
public class RedGreenBlue
{
    public static void wait (int n)
    {
        long t0,t1;
        t0 = System.currentTimeMillis();
        do
        {
            t1=System.currentTimeMillis();
        }
        while (t1-t0<1000);
    }
    public static Picture redscale(Picture picture)
    {
        int y0 = picture.height();
        int x0 = picture.width();
        for (int x = 0; x < x0; x+=1)
        {
            for (int y = 0; y < y0; y+=1)
            {
                java.awt.Color initcolor = picture.get(x,y);
                int r = 255;
                int b = initcolor.getBlue();
                int g = initcolor.getGreen();

                java.awt.Color newcolor = new java.awt.Color(r,g,b);
                picture.set(x, y, newcolor);
            }
        }
        return picture;
    }
    public static Picture greenscale(Picture picture)
    {
        int y0 = picture.height();
        int x0 = picture.width();
        for (int x = 0; x < x0; x+=1)
        {
            for (int y = 0; y < y0; y+=1)
            {
                java.awt.Color initcolor = picture.get(x,y);
                int r = initcolor.getRed();
                int b = initcolor.getBlue();
                int g = 255;

                java.awt.Color newcolor = new java.awt.Color(r,g,b);
                picture.set(x, y, newcolor);
            }
        }
        return picture;
    }
    public static Picture bluescale(Picture picture)
    {
        int y0 = picture.height();
        int x0 = picture.width();
        for (int x = 0; x < x0; x+=1)
        {
            for (int y = 0; y < y0; y+=1)
            {
                java.awt.Color initcolor = picture.get(x,y);
                int r = initcolor.getRed();
                int b = 255;
                int g = initcolor.getGreen();

                java.awt.Color newcolor = new java.awt.Color(r,g,b);
                picture.set(x, y, newcolor);
            }
        }
        return picture;
    }
    public static Picture grayscale(Picture picture)
    {
        int y0 = picture.height();
        int x0 = picture.width();
        //get color of each pixel, convert to grayscale, set color to gray
        for (int x = 0; x < x0; x+=1)
        {
            for (int y = 0; y < y0; y+=1)
            {
                java.awt.Color initcolor = picture.get(x,y);
                java.awt.Color graycolor = Luminance.toGray(initcolor);
                int r = graycolor.getRed();
                int b = graycolor.getBlue();
                int g = graycolor.getGreen();

                java.awt.Color newcolor = new java.awt.Color(r,g,b);
                picture.set(x, y, newcolor);
            }
        }
        return picture;
    }


    public static void main(String[] args)
    {
        String pic = args[0]; //Path to PICTURE
        Picture picture = new Picture(pic); //Create new Picture object
        //picture.show();
        picture = grayscale(picture); //iterates over all pixels in file, shows resulting image
        picture.show();
        wait(0);
        Picture redpicture = new Picture(picture);
        Picture greenpicture = new Picture(picture);
        Picture bluepicture = new Picture(picture);
        redpicture = redscale(redpicture);
        redpicture.show();
        wait(0);

        greenpicture = greenscale(greenpicture);
        greenpicture.show();
        wait(0);

        bluepicture = bluescale(bluepicture);
        bluepicture.show();
        wait(0);
    }
}