Applying filters to specific region within frame

Question

Hi all,
Forgive me if this is an obvious thing, but I'm trying to learn FCP quickly coming from Adobe Premiere. How do I select a specific area of a clip and then apply a filter to either that area, or everything else? For example, let's say I select an area using colour correction. Obviously if I invert the selection then, say, use the saturation slider I can pick out one colour and make everything else b&w, but what about if I wanted to use that region to, say, apply a blur filter to it? And also, is there a tool which allows me to select a regular region (say an oval) to do the same?
Thanks,
Sean

Answer 1

Thanks Shane- I thought about doing it that way. Can you dynamically mask out everything but one colour in this way? In the PC setup we are getting rid of at work we use a bit of realtime hardware from Canopus (Raptor RT card) which enables region selection in a wide variety of ways. You can then apply filters inside the selection or outside, or both, and these can be different filters. That's the sort of thing I'm trying to work out.
Sean