What does an High Pass Filter do?

Will it add realism?

it helps bring a I guess a better texture, clear or so. https://www.youtube.com/watch?v=mOHPQbyHbtI

if you find anything on digital image painting with image textures let me know. know body has done a tutorial yet, its always a color or paint but not a image texture. or would love to see brushes made like wood brushes but no tutorials on that.

a high-pass removes the LOW frequency data
for example

this DEM created from a mesh of the Asteroid Ceres
http://7.t.imgbox.com/bLlxeDWY.jpg
the HIGH pass is on the Left
the DEM is in meters for the Radii of the asteroid is on the right

8 bit png’s of the 32 bit originals

the HIGHPASS
http://0.t.imgbox.com/XHXwKfab.jpg

and the RADII in Meters map
http://1.t.imgbox.com/HTEnKAmZ.jpg