dissolve

Hi, I was wondering if anybody knows how it works as it does in the image below, when two colors overlap, they change into a different one (specifically one in the color palet used by this artist, @kid_woof on insta). Thanks!

I don't mean lens flares, I can generally take care of them , but I've been trying to remove the halo effect around the sun in sunset/sunrise photos and its really hard. Check out these 2 pics: I've tried selecting and filling with content aware on normal and dissolve. Heal doesn't work...