How do you exclude certain players from seeing the effects of post process?

How do I make it so that only 1 person can see the post processing?
I’m using post process as a debuff to a character.
Someone will cast the spell to the enemy, and then the enemy will ‘hallucinate’. (i.e post processing)
But I don’t want anyone else to see the post process, as obviously the post process volume needs to be unbound when the spell is cast.

Thanks in advance.

Could you please explain how I would override scene post process? Thanks

you just need to set the post process blend weight. you can modify its value in the details panel with the camera selected (camera settings section, see picture) and you can modify it via blueprint by using either of the nodes shown in the picture below. a value of 1 will use the players camera post process and a value of 0 will use the world post process. note though that some effects cant be blended but are more like a on to off transition. i tried using this with a post process material asset but it could only be on or off no in between.

Thank you so much.

have you tried just modifying the post process on that one players camera? every camera has a built in post process that can override the scene one, it also has the ability to blend from one to the other.