This is an ENBSeries graphics modification to improve the aesthetics of the game in a cold way. More info on ENB on official site : http://enbdev.com/
Please keep in mind that this was achieved while using the special global.iff from SJ1414 & Johndoe22 Heaven on earth v2 : viewtopic.php?f=149&t=87975
Can't remember where I took enbseries.ini 2 or 3 years ago, before these slight modifications.