convert Grey Image - Android Graphics

Android examples for Graphics:Bitmap Color

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Description

convert Grey Image

Demo Code


//package com.book2s;
import android.graphics.Bitmap;

public class Main {

    public static Bitmap convertGreyImg(Bitmap img) {
        int width = img.getWidth(); 
        int height = img.getHeight(); 

        int[] pixels = new int[width * height];

        img.getPixels(pixels, 0, width, 0, 0, width, height);
        int alpha = 0xFF << 24;
        for (int i = 0; i < height; i++) {
            for (int j = 0; j < width; j++) {
                int grey = pixels[width * i + j];

                int red = ((grey & 0x00FF0000) >> 16);
                int green = ((grey & 0x0000FF00) >> 8);
                int blue = (grey & 0x000000FF);

                grey = (int) ((float) red * 0.3 + (float) green * 0.59 + (float) blue * 0.11);
                grey = alpha | (grey << 16) | (grey << 8) | grey;
                pixels[width * i + j] = grey;
            }/*from ww  w  .jav a  2  s .c o  m*/
        }
        Bitmap result = Bitmap.createBitmap(width, height,
                Bitmap.Config.RGB_565);
        result.setPixels(pixels, 0, width, 0, 0, width, height);
        return result;
    }
}

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