Image Filters

[Ardnived]

I've seen in a few maps that images can be displayed over the screen, I think I heard somewhere that they use some sort of filter:

If someone could point me in the direction of a tutoriol on how to do this, that'd be great

 

[Thrikodius]

Cinematic - Fade Filter. Here is the tutorial from wich I learned how to use my own custom image.
http://world-editor-tutorials.thehelper.net/fading.php

 

[Ardnived]

awesome thanks