设置为灰度图

1. public Bitmap toGrayscale(Bitmap bmpOriginal){
2. int width, height;
3. height = bmpOriginal.getHeight();
4. width = bmpOriginal.getWidth();
5. Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
6. Canvas c = new Canvas(bmpGrayscale);
7. Paint paint = new Paint();
8. ColorMatrix cm = new ColorMatrix();
9. cm.setSaturation(0);
10. ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
11. paint.setColorFilter(f);
12. c.drawBitmap(bmpOriginal, 0, 0, paint);
13. return bmpGrayscale;
14. }