Filtering

Last week We were testing some equipment, and enjoying a great spring day in the tundra.
I was messing about with my wideangle lense and got a rather interesting of Nick, the wid angle really exagerated the nose and chin.

I ran a high pass filter on a copy layer in photoshop, made the layer monochrome, and pumped up the contrast, then reduced the opacity of the copy layer. This filtering exagerates textures and variations in contrast.

As a side note: similar filtering it used in the processing of geophysical data, though not the kind we are producing here.