adjust Bitmap Tone - Android Graphics

Android examples for Graphics:Bitmap Effect

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Description

adjust Bitmap Tone

Demo Code

/**//from w ww.ja v a  2  s  . co  m
 * Copyright 2014 Zhenguo Jin
 *
 * 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.
 */
//package com.java2s;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;

import android.graphics.Color;

public class Main {

    public static Bitmap adjustTone(Bitmap src, int delta) {
        if (delta >= 24 || delta <= 0) {
            return null;
        }
        // 
        int[] gauss = new int[] { 1, 2, 1, 2, 4, 2, 1, 2, 1 };
        int width = src.getWidth();
        int height = src.getHeight();
        Bitmap bitmap = Bitmap.createBitmap(width, height, Config.RGB_565);

        int pixR = 0;
        int pixG = 0;
        int pixB = 0;
        int pixColor = 0;
        int newR = 0;
        int newG = 0;
        int newB = 0;
        int idx = 0;
        int[] pixels = new int[width * height];

        src.getPixels(pixels, 0, width, 0, 0, width, height);
        for (int i = 1, length = height - 1; i < length; i++) {
            for (int k = 1, len = width - 1; k < len; k++) {
                idx = 0;
                for (int m = -1; m <= 1; m++) {
                    for (int n = -1; n <= 1; n++) {
                        pixColor = pixels[(i + m) * width + k + n];
                        pixR = Color.red(pixColor);
                        pixG = Color.green(pixColor);
                        pixB = Color.blue(pixColor);

                        newR += (pixR * gauss[idx]);
                        newG += (pixG * gauss[idx]);
                        newB += (pixB * gauss[idx]);
                        idx++;
                    }
                }
                newR /= delta;
                newG /= delta;
                newB /= delta;
                newR = Math.min(255, Math.max(0, newR));
                newG = Math.min(255, Math.max(0, newG));
                newB = Math.min(255, Math.max(0, newB));
                pixels[i * width + k] = Color.argb(255, newR, newG, newB);
                newR = 0;
                newG = 0;
                newB = 0;
            }
        }
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }
}

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