grayscale Bitmap - Android Graphics

Android examples for Graphics:Bitmap Scale

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Description

grayscale Bitmap

Demo Code


//package com.java2s;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;

public class Main {
    public static Bitmap grayscaleBitmap(Bitmap bmp) {
        ColorMatrix cm = new ColorMatrix(new float[] { 0.3f, 0.59f, 0.11f,
                0, -24, 0.3f, 0.59f, 0.11f, 0, 40, 0.3f, 0.59f, 0.11f, 0,
                64, 0, 0, 0, 1, 0 });//from w  ww . ja va 2 s .  c  o  m

        Bitmap ret = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(),
                bmp.getConfig());

        Canvas canvas = new Canvas(ret);

        Paint paint = new Paint();
        paint.setColorFilter(new ColorMatrixColorFilter(cm));
        canvas.drawBitmap(bmp, 0, 0, paint);

        return ret;
    }
}

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