Can the entire screen be filtered with a Core Image filter?

(edited for SO):开发者_运维知识库 Under OS X (any release), is it possible to apply Core Image filters to the entire screen? If so, what are the relevant functions, classes or methods (or appropriate section of the documentation), to get started?

I've been digging through Apple's Core Image documentation, but haven't made much progress towards this particular goal.

The answer is yes, you can apply a filter to the whole screen, but only through code, example: Nocturne.

But there’s no “AU Lab” for CodeImage that I know off.