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.Canvas;

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

import android.graphics.Paint;

public class Main {
    /**
     * Method to remove colors in a Bitmap, creating a gray scale image.
     *
     * @param source The original Bitmap.
     * @return The gray scale Bitmap.
     */
    public static Bitmap toGrayscale(Bitmap source) {
        Bitmap bmpGrayscale = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bmpGrayscale);
        canvas.drawBitmap(source, 0, 0, getGrayScalePaint());
        return bmpGrayscale;
    }

    private static Paint getGrayScalePaint() {
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);
        ColorMatrixColorFilter colorMatrixColorFilter = new ColorMatrixColorFilter(cm);
        paint.setColorFilter(colorMatrixColorFilter);
        return paint;
    }
}