Aparte de cualquier otro error, necesito una forma de convertir mi Color grayScale en un int. Cuando conecto el color, aparece un error. El método setRGB toma una x, a y y un rgb int como parámetros. ¿Cómo cambio mi color a int?

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.image.*;
import javax.imageio.ImageIO;

public class Picture{
    Container content;    
    BufferedImage image, image2; 
    public Picture(String filename) {
        File f = new File(filename);
        //assume file is the image file
        try {
            image = ImageIO.read(f);
        } 
        catch (IOException e) {
            System.out.println("Invalid image file: " + filename);
            System.exit(0);
        }
    }

    public void show() {
        final int width = image.getWidth();
        final int height = image.getHeight();

        JFrame frame = new JFrame("Edit Picture"); 

        //set frame title, set it visible, etc
        content = frame.getContentPane();
        content.setPreferredSize(new Dimension(width, height));
        frame.pack();
        frame.setResizable(false);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //add a menubar on the frame with a single option: saving the image
        JMenuBar menuBar = new JMenuBar();
        frame.setJMenuBar(menuBar);
        JMenu fileMenu = new JMenu("File");
        menuBar.add(fileMenu);
        JMenuItem saveAction = new JMenuItem("Save");
        fileMenu.add(saveAction);
        JMenuItem grayScale = new JMenuItem("Grayscale");
        fileMenu.add(grayScale);
        grayScale.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    grayscale(width, height);
                }
            });

        //add the image to the frame
        ImageIcon icon = new ImageIcon(image);
        frame.setContentPane(new JLabel(icon));

        //paint the frame
        frame.setVisible(true);
        frame.repaint();
    }

    public void grayscale(int width, int height) {
        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                Color color = new Color(image.getRGB(i, j));
                int red = color.getRed();
                int green = color.getGreen();
                int blue = color.getBlue();
                int rGray = red*(1/3);
                int gGray = green*(2/3);
                int bGray = blue*(1/10);
                Color grayScale = new Color(rGray, gGray, bGray);
                image.setRGB(i,j, grayScale);
            }
        }
        show();
    }

    public static void main(String[] args) {
        Picture p = new Picture(args[0]);
        p.show();
    }
}