Modifying Bitmap from resources
Drawable homeImage = mHomeImage.getBackground(); // my ImageView
homeImage.mutate();
Canvas c = new Canvas(((BitmapDrawable)homeImage).getBitmap());

Bitmap bmp1 = (((BitmapDrawable)homeImage).getBitmap())
        .copy(Config.ARGB_8888, true);
Canvas c = new Canvas(bmp1);