Hi there,
I have been using Fakelottes shader for years now, thanks @Hunterk for creating it!
Now, it has two gamma parameters: “crt gamma” and “monitor gamma”. I usually have them on my Picade screen like this: crt gamma 2.20 monitor gamma 2.50
…But I don’t know what’s the difference between them. Can you guys please explain those two parameters or point me to the place where I can read about their differences?
Thanks!
It’s for gamma correction. The masks have to be applied in linear gamma instead of the normal, curved gamma, so we approximately linearize it by pow-ing it by 2.2 and then we de-linearize it by doing the inverse (pow-ing by 1.0/2.2). However, CRTs were designed to use a higher/darker gamma rating than the standard 2.2, so we can over/-under-shoot the delinearization to leave some of that darker gamma. And that’s what those options are for.
So am I right on having a higher value for “monitor gamma” than the one for “crt gamma”? Or should it be the opposite?
It’s arbitrary / to taste. IMO, it would make sense for it to be 2.5 for crt gamma and 2.2 for monitor gamma but ultimately you probably just want it a little darker, however that happens.
Yes, a little darker is better… at night, default settings are a bit uncomfortable.
Thanks for your anwers! 