I have a `BufferedImage`. I want to do two copy of it, to write some things with their Graphics. But, if I *write* something on one, it will do the same on all the other copy, so I tried to do `image.getSubImage(0, 0, image.getWidth(), image.getHeight());`, but it doesn't change anything.

I don't know what to do, it would be super to help me.