render layer id values

[cdavis]

I have a scene with a beauty master layer & then 3 id matte render layers all with differently assigned R,G or B surface shaders so i can pull mattes off in nuke. But the values dont seem to be pure R,G or B . What should my color mapping settings be to retain a 100% R,G or B?

ANy ideas

Thanks

[Yannick]

Do you have a physical camera? Is there any tone mapping happening?

[cdavis]

yes, ! physical cam!

[Yannick]

Got caught up a couple of time.

[cdavis]

yeah, caught out by that. sorted it! Cheers!