Is it possible to put some kind of a photo filter effect over SpriteKit Scene?
I am creating a game and at certain points I'd like to make it more difficult with a effect like Sepia, Black&White, Chrome or something similar.
So far I have just created an image which I present with a low alpha value over the scene as a SKSpriteNode, but that is not really what I want, a realtime filter like Black&White would be better.