Java BufferedImage Operation computeBrightnesses(final BufferedImage image)

Description

compute Brightnesses

License

Apache License

Declaration

private static double[][] computeBrightnesses(final BufferedImage image) 

Method Source Code

//package com.java2s;
/*//from   w w  w.  ja  v  a 2  s  .  co m
 * Copyright 2012 Alexey Ivanov
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.awt.image.BufferedImage;

public class Main {
    private static double[][] computeBrightnesses(final BufferedImage image) {
        final int width = image.getWidth();
        final int height = image.getHeight();
        final double[][] brightnesses = new double[width][height];
        for (int i = 0; i < width; ++i) {
            for (int j = 0; j < height; ++j) {
                brightnesses[i][j] = getBrightness(image, i, j);
            }
        }
        return brightnesses;
    }

    private static double getBrightness(final BufferedImage image, final int x, final int y) {
        final int rgb = image.getRGB(x, y);
        final int red = getRed(rgb);
        final int green = getGreen(rgb);
        final int blue = getBlue(rgb);
        return 255 - (0.299 * red + 0.587 * green + 0.114 * blue);
    }

    private static int getRed(final int rgb) {
        return doGet(rgb, 16);
    }

    private static int getGreen(final int rgb) {
        return doGet(rgb, 8);
    }

    private static int getBlue(final int rgb) {
        return doGet(rgb, 0);
    }

    private static int doGet(final int rgb, final int s) {
        return (rgb >> s) & 0xFF;
    }
}

Related

1. chunk(BufferedImage image)
2. circularize(BufferedImage image)
3. cleanBinaryImage(BufferedImage image)
4. compose(BufferedImage image, BufferedImage mask)
5. composite(BufferedImage bg, BufferedImage fg)
6. computeTrimmedBounds(BufferedImage image, Rectangle tbounds)
7. conformImageToInt(BufferedImage in)
8. contrast(BufferedImage src, float scaleFactor)
9. criarImagemCompativel(BufferedImage original, int largura, int altura, boolean manterQualidade)