Android 图片转灰度

	/**
	 * 图片转灰度
	 * 
	 * @param bmSrc
	 * @return
	 */
	public static Bitmap bitmap2Gray(Bitmap bmSrc)
	{
		int width, height;
		height = bmSrc.getHeight();
		width = bmSrc.getWidth();
		Bitmap bmpGray = null;
		bmpGray = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
		Canvas c = new Canvas(bmpGray);
		Paint paint = new Paint();
		ColorMatrix cm = new ColorMatrix();
		cm.setSaturation(0);
		ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
		paint.setColorFilter(f);
		c.drawBitmap(bmSrc, 0, 0, paint);

		return bmpGray;
	}

效果图：