How to recreate color blurring/"dreamy" effect seen in AC2

I want to add a similar distant blur seen in AC2, (screenshot below), which looks like it may be blurring just the colors and not the values of the image, or maybe it’s some sort of bloom/glow that doesn’t brighten but just has the blurring qualities. Maybe someone will know exactly what it is which would be helpful. Whatever it is I hope you get what I mean from the description and image.

It also becomes greater the further distance it is but I think I can do that myself, feel free include how to do that too if you want to though. I want to specifically do this in a post process material.

Managed to do it myself, plug any standard blur setup into B (the current one is VERY unoptimised so I’ll be changing it, I’d recommend finding one yourself), and use this formula to make it increase per distance (and clamp at a far distance as to not blur the skybox), and it seems to blur everything BUT the outline of objects, which achieves the exact effect I’m looking for, seen below.