I've tried to put the monochrome effect on a layer for my xna project i had set for Display Mode : Direct3D 9, when i run the application from mmf it's all right the image goes monochrome but when i have built the project in the content the effect has been exported as mono.fx file but when i run the project the effect seems not to be applied on layer, it would be really nice also that a effect could be used on all the frame to include all the layers to got the same effect.