I've been keeping an eye on the real world... hah. I noticed that, appart from subtle HDR-ish effects, this generic term, "bloom," is really caused by -- if I can find the correct word -- aberration. I find a lot of chromatic distortion, and it's mostly like a specular phenomenon. I don't see this kind of bloom bleeding around the windows, or at the horizon unless I'm in a comparatively dark room (i.e. HDR is at work, with a much more subtle kind of "bloom") To speak roughly in graphical terms (meh), this definitely is not screen-space. It's like when light is diffracted within a semi-transparent layer of a material -- most strong along tangents (towards camera) -- it appears to exit such a surface with various distortions; i.e. chromatic aberration not occuring with a subject medium being a lense -- as I was introduced to it -- but a surface in "the world."
Edited by Reflexus, 24 May 2013 - 03:11 PM.