ENB also know as:
Vanilla PTGI ENB

What is ENB you may ask well it's:
ENBSeries is 3d graphic modification for games like TES Skyrim, TES Oblivion, Fallout, GTA, Deus Ex, and others. It work by modifying render functions calls of the games and applying additional effects.
It's divided to generic versions and exclusive. First category allow to run it on thousands of games, not all effects will work, but you can try several versions of mod to find best suited. Second, exclusive types of the mod,
are games specific versions which developed to work with some game and rarely with same game engine.
Available effects are SSAO, SSIL, Depth Of Field, Lens FX, Bloom, HDR, Tone Mapping, Sharpening, Sun Rays, Shadows, Detailed Shadows, Reflection and others in various versions of them.

Scuffed enb with some ptgi going on, designed with vanilla timecycles in mind.

Notes:

Note:
nve's postpassfx is used in the pictures to color grade.

note 2:
If you wanna use it in online it will work, but it is not recommended and somewhat considered cheating. USE IT AT YOUR OWN RISK

note3:
If you fell that the game is to dark or if you suffer fps lose disable ambient occlusion in-game settings.

note4:
make sure to have all grapichs settings set to max except resolution scalling.

Vanilla PTGI ENB offers tons of features as:
-screen space ptgi
-removed yellowness and blue shadows/tint
-removed chromatic aberration and lens distortion
-removed anamorphic lens flares
-highly reduced original bloom
-lighting rework
-golden shine at sunrise and sunset
-some better bloom
-fog reduce (doesn't work with msaa on)
-procedural shadows
-enhanced ssao
-enhanced reflections (vehicles, puddles etc.)
-darker nights

Make sure to check on ENB screenshots to see the difference between vanilla game and PTGI

known problems:
vehicle glass appears green under direct lighting
ssao and ptgi can be glitchy (a lot of color banding) under dark lighting

credits:
Boris Vorontsov for enb
Razed for nve's postpassfx