Hey this is my first time posting on the forums, hopefully this is the correct area for my issue.
Currently I am working on a level for my course, and I wanted to go with a Sin City style of game. (http://gyazo.com/f19a7663fbe6ecec4c02efd6eb3adb73) Black and white with certain colors such as Red, Blue, and Yellow that are still visible in game.
I achieved the Black and white by using a post processing volume and tuning off the saturation (http://gyazo.com/3332bc43060ef6176f87eafe941f17a0) however I found no way to exclude certain colors, objects or materials from this. (http://gyazo.com/1787ac6223d3888c31fd5ea159a4cd1c).
I have played about with the film tint settings by turning up the red section (http://gyazo.com/e9824a577aefac5140d7c95f2204555e) however this just makes red objects generate light (http://gyazo.com/3a2af5002d83df3c2233d101049ce723)
My tutor told me that in UDK (unreal 3) it was possible to exclude objects taking light. However after searching we failed to find anything.
Any other methods to achieve what I am after or is the process not possible yet?