This will be hard to explain, but make a unit and have this in the init:
this exec "camera.sqs";
After that you can test it on preview, while you are in the preview press "ESC" and press the button "Again". When it previews again the camera creates fake wounds or atleast the screen goes purple/blue. The video shows you what I mean.

This annoyed me as I was making a intro for my upcoming scenario mission.