How to get max 5 color from image??

I try to get max 5 color from image (ex. jpeg,gif) ,I use PixelGrabber
it too slowly when i use large image,Please help me, to run more fast
(other way PixelGrabber)
best regard
[email protected],[email protected]
source below:
public String generateColor(InputStream source,String filePath){
BufferedImage image = null;
String RGB = "";
System.out.println("==generateColor==");
try {
image = ImageIO.read(source);
catch (IOException ex1) {
ex1.printStackTrace();
//image.getGraphics().getColor().get
// BufferedImage image2 = ImageIO.read(source);
// image.getColorModel().getNumColorComponents()
if(image.getColorModel() instanceof IndexColorModel) {
IndexColorModel icm = (IndexColorModel)image.getColorModel();
byte[][] data = new byte[3][icm.getMapSize()];
int[] rgbB = new int[icm.getMapSize()];
icm.getRGBs(rgbB);
String dataHtm = "<HTML><table width=\"100\" border=\"0\"><tr>";
for(int i = 0 ;i< rgbB.length;i++){
int r = (rgbB[i] >> 16) & 0xff;
int g = (rgbB[i] >> 8) & 0xff;
int k = (rgbB) & 0xff;
System.out.println("red:" + Integer.toHexString(r));
System.out.println("green:" + Integer.toHexString(g));
System.out.println("blue:" + Integer.toHexString(k));
dataHtm = dataHtm + "<td width=\"10\" bgcolor=\"#" + Integer.toHexString(r)+Integer.toHexString(g)+Integer.toHexString(k);
dataHtm = dataHtm + "\"> </td>";
dataHtm = dataHtm + "</tr></table></HTML>";
try {
BufferedWriter out = new BufferedWriter(new FileWriter("c:\\23289207.html"));
out.write(dataHtm);
out.close();
catch (IOException e) {
e.printStackTrace();
int w = image.getWidth();
int h = image.getHeight();
int[] pixels = new int[w*h];
int[] pixs = new int[w*h];
System.out.println("image width:"+w+"image hight:"+h+"image w*h:"+(w*h));
Image img = Toolkit.getDefaultToolkit().getImage(filePath);
PixelGrabber pg = new PixelGrabber(img, 0,0, w, h, pixels, 0, w);
try {
pg.grabPixels();
catch (Exception x) {
x.printStackTrace();
String picColor = "";
Stack stackColor = new Stack();
Hashtable hashColor = new Hashtable();
for (int i = 0; i < w * h; i++) {
int rgb = pixels[i];
int a = (rgb >> 24) & 0xff;
int r = (rgb >> 16) & 0xff;
int g = (rgb >> 8) & 0xff;
int k = (rgb) & 0xff;
i = i+1000;
//System.out.println("i:" + i);
picColor = convertToSring(r)+convertToSring(g)+convertToSring(k);
stackColor.add(picColor);
//System.out.println("picColor:"+picColor);
// System.out.println("\n\n a:" + a);
// System.out.println("red:" + r);
// System.out.println("green:" + g);
// System.out.println("blue:" + k);
}//end for
getMaxColor(stackColor);
System.out.println("==generateColor==end\n\n");
return null;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
public class HighFive
    private void examineColors(BufferedImage image)
        long start = System.currentTimeMillis();
        int w = image.getWidth(), h = image.getHeight();
        int[] rgbs = image.getRGB(0,0,w,h,null,0,w);
        findHighFive(rgbs);
        long end = System.currentTimeMillis();
        System.out.println("total time = " + (end - start)/1000.0 + " seconds");
    private void findHighFive(int[] colors)
        int[] uniqueColors = getUniqueColors(colors);
        int[] colorCounts = getColorCounts(uniqueColors, colors);
        int[] highFive     = getHighFive(colorCounts);
        // for each value of highFive find index in colorCounts
        // and use this index to find color code in uniqueColors
        for(int j = 0; j < highFive.length; j++)
            int index = findIndexInArray(colorCounts, highFive[j]);
            Color color = new Color(uniqueColors[index]);
            String s = color.toString();
            s = s.substring(s.indexOf("["));
            System.out.println("color " + s + " occurs " +
                                highFive[j] + " times");
    private int[] getUniqueColors(int[] colors)
        // collect unique colors
        int[] uniqueColors = new int[colors.length];
        int count = 0;
        for(int j = 0; j < colors.length; j++)
            if(isUnique(uniqueColors, colors[j]))
                uniqueColors[count++] = colors[j];
        // trim uniqueColors
        int[] temp = new int[count];
        System.arraycopy(uniqueColors, 0, temp, 0, count);
        uniqueColors = temp;
        return uniqueColors;
    private int[] getColorCounts(int[] uniqueColors, int[] colors)
        // count the occurance of each unique color in colors
        int[] colorCounts = new int[uniqueColors.length];
        for(int j = 0; j < colors.length; j++)
            int index = findIndexInArray(uniqueColors, colors[j]);
            colorCounts[index]++;
        return colorCounts;
    private int[] getHighFive(int[] colorCounts)
        // find five highest values in colorCounts
        int[] highFive = new int[5];
        int count = 0;
        for(int j = 0; j < highFive.length; j++)
            int max = Integer.MIN_VALUE;
            for(int k = 0; k < colorCounts.length; k++)
                if(colorCounts[k] > max)
                    if(isUnique(highFive, colorCounts[k]))
                        max = colorCounts[k];
                        highFive[count] = colorCounts[k];
            count++;
        return highFive;
    private boolean isUnique(int[] n, int target)
        for(int j = 0; j < n.length; j++)
            if(n[j] == target)
                return false;
        return true;
    private int findIndexInArray(int[] n, int target)
        for(int j = 0; j < n.length; j++)
            if(n[j] == target)
                return j;
        return -1;
    public static void main(String[] args) throws IOException
        String path = "images/cougar.jpg";
        Object o = HighFive.class.getResource(path);
        BufferedImage image = ImageIO.read(((URL)o).openStream());
        new HighFive().examineColors(image);
}

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