Wierd Zdepth channel ?

[critical111]

I noticed that from all software on this planet, keyshot produces a unique zdepth image. Instead of graying out the distance:
http://rbcdn.polytown.netdna-cdn.com/wp-content/uploads/2010/04/making-gh-house-ivo-sucur-exterior_wireframe_zdepth.jpg

it actually has a white blur mask. So it's useless in compositing:
http://www.frischluft.com/lenscare/

anyone has a solution how to produce the greyed distance output I tried all possible combinations...

[Chad Holton]

White blur mask - what do you mean? It's working fine for me when compositing.