灰度图画法

public Bitmap toGrayscale(Bitmap bmpOriginal)?
{ ? ? ? ??
? ? int width, height;?
? ? height = bmpOriginal.getHeight();?
? ? width = bmpOriginal.getWidth(); ? ??
?
? ? Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);?
? ? Canvas c = new Canvas(bmpGrayscale);?
? ? Paint paint = new Paint();?
? ? ColorMatrix cm = new ColorMatrix();?
? ? cm.setSaturation(0);?
? ? ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);?
? ? paint.setColorFilter(f);?
? ? c.drawBitmap(bmpOriginal, 0, 0, paint);?
? ? return bmpGrayscale;?
}?