Those are both not the monochrome effect :P
If you are using postprocessing for the monochrome effect, objectshaders can´t have any impact on it, or at least that is the case if everything works as it is meant to...

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com