Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.graphics.Bitmap;

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

import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;

public class Main {
    /**
     * Convert bitmap to the grayscale
     * http://androidsnippets.com/convert-bitmap-to-grayscale
     *
     * @param bmpOriginal Original bitmap
     * @return Grayscale bitmap
     */
    public static Bitmap toGrayscale(Bitmap bmpOriginal) {
        final int height = bmpOriginal.getHeight();
        final int width = bmpOriginal.getWidth();

        final Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Config.ARGB_8888);
        final Canvas c = new Canvas(bmpGrayscale);
        final Paint paint = new Paint();
        final ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);
        final ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
        paint.setColorFilter(f);
        c.drawBitmap(bmpOriginal, 0, 0, paint);
        return bmpGrayscale;
    }
}