That is how the picture is. Grid is disabled. That is not a photograph it is a texture for a computer model It looks fine in photoshop, however xnview cannot display it properly. In the past I had not problem opening 16bit tif files with xnview.
The real image has nothing to do with how it looks in the xnview screenshot. Do you see the banding and crazy noise? That is not the nature of my original image. Anyways this image not the only case, all my 16bit images looks like they have bandings and crazy noise in them in Xnview