import java.awt.*;
import java.awt.image.*;

public class GreyScale {

    static ImageTool imTool = new ImageTool ();

    public static void main (String[] argv)
    {
        // Read in an image and display.
        Image image = imTool.readImageFile ("statue.jpg");
        imTool.showImage (image, "original");

        // Convert to grey scale and display.
        Image greyImage = toGreyScale (image);
        imTool.showImage (greyImage, "grey-scale");
    }
    
    static Image toGreyScale (Image image)
    {
        // Extract pixels and size.
        int[][][] pixels = imTool.imageToPixels (image);
        int numRows = pixels.length;
        int numCols = pixels[0].length;

        // Make array of exactly the same size.
        int[][][] greyPixels = new int [numRows][numCols][4];

        // INSERT YOUR CODE HERE

        Image greyImage = imTool.pixelsToImage (greyPixels);
        return greyImage;
    }

}