How do I make a Neverending Nightmares-like effects?

Hello. I am quite new to Unreal Engine and I would like to make a horror game. I was thinking about using an art style similar to the game Neverending Nightmares (screenshot below), having the game be black and white with colors only on objects that can be interacted with. How do I do this with post processing effects? Thanks for your help.

Hey XanderTheFeind -

You would need to make use of the Custom Depth setting on objects that you will want to render in color, or invert the LERP in the following logic and the objects will be in black and white with the rest of the scene in color.

Post Process Material:

Results:

Thank You

Eric Ketchum

Okay cool. What exactly would that subtract node do and how do I put 1e+004 as a constant?

The Subtract is lowering the effective size of the Depth calculations (the numbers generated are effectively very large and need to be lowered to a more UV compatible range. the 1e+004 is 10,000.

Thank You

Eric Ketchum

Great! Thank you so much for your help.