Nah the guy is Chinese. I could tell. There are many people from Hongkong and even mainland China who don't appreciate their own country. If you frequent Chinese forums you run into a bunch of them. The worst makes the trolls on this forum look like snow white.
I am using photoshop but there is a procedure to carry these tests out.. I hope this can well be performed using any software. Important aspect is approach to find an image using principle of Levels found in image. If it is indeed as successful as it is appearing.. I might go and develop small desktop application for that and that will be unique application of its kind. But for now things are in the development phase.. even the approach needs fine-turning