I use f.lux. But I don’t like the way games look with it on, especially when I’m trying a new one. I wanted to play Gravity Ghost, but I couldn’t minimize it, nor could I use a second screen to use f.lux’s “disable” option from the menubar.

So I did it by hand.

Located here. Located here. Add a line for the desired application. Add a line for the desired application.

I found the f.lux plist file and added a line with disable- then the reverse URL name of the app I wanted to disable f.lux from affecting. You can find that in ~/Library/Preferences easily enough. There are other ways, I'm sure.