Help understanding how to display a raster image

Hi.
I apologise in advance if this question sounds a bit convoluted but I've got a bit confused as to how to go about this.
I have an Ascii-grid file that's been exported from ArcMap and I want to draw it onto a JPanel.
This particular grid is a DEM but it would be good if it could produce this for any grid, if it makes any difference.
The problem is I don't really even know where to start...I've looked at using colormodels, data buffers etc for creating a raster but I'm not really sure how to get the ascii data I have into any of these.
Do I remove the pixel data from the integer values in the file before etc and if so how do I go about this?
In addition is it possible to make a colormodel from a standard int array, if it was created in a particular pattern for example for designated height values.
Some help in working out how to go about this would be very welcome as I'm lost as to what to do. Even just some pointers in the right direction. I'm more than happy to go and work it out I just don't really know where to start.
Cheers.

Sounds something like a contour map. I'm sure there must be a technically superior (read: horribly complicated) way to do this using IndexColorModel, WriteableRaster etc etc but if the performance is satisfactory I would go with a simple BufferedImage and setRGB.import java.awt.Color;
import java.awt.image.BufferedImage;
import javax.swing.*;
public class ContourMap {
private int[] colors = {
 Color.BLACK.getRGB(),
 Color.GREEN.getRGB(),
 Color.YELLOW.getRGB(),
 Color.RED.getRGB()
public static void main(String[] args) {
 SwingUtilities.invokeLater(new Runnable() {
 @Override
 public void run() {
 new ContourMap().makeUI();
public void makeUI() {
 String[] strData = {
 "000000000000000",
 "000000111000000",
 "000111221110000",
 "001112222111000",
 "001122332211000",
 "001112222111000",
 "000111221110000",
 "000000111000000",
 "000000000000000"
 BufferedImage image = new BufferedImage(strData.length, strData[0].length(),
 BufferedImage.TYPE_INT_ARGB);
 for (int i = 0; i < strData.length; i++) {
 for (int j = 0; j < strData[0].length(); j++) {
 image.setRGB(i, j, colors[strData.charAt(j) - '0']);
System.out.println();
JLabel label = new JLabel(new ImageIcon(image), JLabel.CENTER);
JFrame frame = new JFrame();
frame.add(label);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
db
edit And oh, the data is in a hardcoded String array only because I couldn't be bothered adding all the commas to make it a int[][] after copying from your post
Edited by: Darryl Burke

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