Java BufferedImage Operation scrapeColors(BufferedImage image)

Description

Get's all of the unique colors in an image.

License

Open Source License

Parameter

Parameter	Description
image	The image.

Declaration

public static byte[][] scrapeColors(BufferedImage image) 

Method Source Code

//package com.java2s;
/*/*www .  ja v a2s. c  o m*/
 * RHQ Management Platform
 * Copyright (C) 2005-2008 Red Hat, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

import java.awt.image.BufferedImage;

import java.awt.image.Raster;

public class Main {
    /**
     * Get's all of the unique colors in an image.
     *
     * @param image The image.
     */
    public static byte[][] scrapeColors(BufferedImage image) {
        int i;
        Raster raster = image.getRaster();
        byte[][] clrs = new byte[raster.getNumBands()][256];
        int[][] pixels = new int[raster.getNumBands()][];
        int nextClr = 0;

        for (int band = 0; band < raster.getNumBands(); band++) {
            pixels[band] = raster.getSamples(0, 0, raster.getWidth(), raster.getHeight(), band, (int[]) null);
        }

        for (int pixel = 0; pixel < pixels[0].length; pixel++) {
            byte red = 0;
            byte green = 0;
            byte blue = 0;

            // Add the clr if it doesn't already exist in the index
            for (i = 0; i < clrs[0].length; i++) {
                red = (byte) pixels[0][pixel];
                green = (byte) pixels[1][pixel];
                blue = (byte) pixels[2][pixel];

                if ((red == clrs[0][i]) && (green == clrs[1][i]) && (blue == clrs[2][i])) {
                    break;
                }
            }

            if ((i == clrs[0].length) && (nextClr < 256)) {
                clrs[0][nextClr] = red;
                clrs[1][nextClr] = green;
                clrs[2][nextClr++] = blue;

                //                System.out.println("{"+Integer.toHexString(red & 0x000000FF)+','+
                //                                   Integer.toHexString(green & 0x0000FF00 >> 8)+','+
                //                                   Integer.toHexString(blue & 0x00FF0000 >> 16)+'}');
            }
        }

        //        System.out.println("Colors: " + nextClr);

        return clrs;
    }
}

Related

1. resampleWithAffineTransformOp(BufferedImage srcImage, double sx, double sy)
2. revertBlackAndWhite(BufferedImage img)
3. roate90(BufferedImage src)
4. sample9Points(BufferedImage src, int x, int y)
5. scanFill(BufferedImage sourceImage)
6. setArrayAlpha(BufferedImage image, int[] array)
7. setArrayColor(BufferedImage image, int[][] array)
8. setBackgroud(BufferedImage image, Color backgroundColor)
9. setBGRPixels(byte[] bgrPixels, BufferedImage img, int x, int y, int w, int h)