Optional Reshade config preset which is compatible with the ENB optional but not with DXVK. Take a look at "Known issues and help" for more information.
I've added Ambient Occulusion and also a clarity filter to give the image more depth and clarity.
This will definitely affect performance so I only recommend to use this Reshade preset if you have good hardware. This Reshade preset doesn't
change any color/brightness related things so Reshade is not necessary for this timecycle mod.
Recommended for cutscenes, screenshots and video recording for instance.

Installation:
1. You need to download Reshade first in order to use this preset.
   Download Link: https://reshade.me/
   
2. Before you run the Reshade installer make sure to move "d3d9.dll" (In case you use the ENB optional) from your GTAIV main folder
   to another location or rename the file temporarily (to "d3d9.dll-bckp" for instance).

2. Move all files from "Files" optional folder (enbseries.ini file can be skipped if you don't use the ENB optional) to your GTA IV main folder and replace existing files.

3. Run the installer > click on "Browse" and select "GTAIV.exe" from your GTA IV main folder > select DirectX 9.

4. Now go back to the installer and click "Browse" and select "NaturalTimecyc_Reshade_Config" and click "Next".

5. On the effect packages page just click "Skip" and on "Finish" then.

6. Open up your GTA IV main folder and rename the new "d3d9.dll" file from Reshade to "reshade.dll".

7. Move your old "d3d9.dll" back to your GTA IV main folder or in case you renamed it change the name back to "d3d9.dll".
 
8. Ingame you need to pres Pos1 to open up the Reshade menu. Go to settings and select "reshade-shaders > Shaders" as shader search path.

9. Now click reload on the effect page and everything should work fine.

9. Done
 
 
Known issues and help:
-Reshade, ENB and DXVK aren't working combined because Reshade and DXVK need different proxy settings for ENB in order to work properly.
 So either use Reshade and DXVK or Reshade and the ENB optional. DXVK can cause visual bugs in combination with ENB or Reshade as well.

-There's a chance that the image appears darker and more contrasted at game start (Only affects game start menu and loading screens)
 because of the Reshade AO. A optional workaround fix could be to set Reshade's config preset to disabled by default and
 enable it manually then when the game is loaded.

-In case the Reshade preset doesn't load automatically when you launch the game you can load the config file manually
 by opening the ingame Reshade menu ("Pos1" by default). Select "NaturalTimecyc_Reshade_Config.ini" in the preset load option.
 Preset should load automatically then.

-In the options tab you can set a custom key to enable/disable all effects and you can also change the key to open/close the Reshade menu.
 Other things are also configurable there. Reshade is easy to use since it works basically like other familiar setting windows.
 
-Make sure to be in performance mode (Little box on the bottom right) for better performance. That should be set by default with my preset.