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Bad blue screen key - How to get rid of edges without losing detail?

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Peter Mayer
Bad blue screen key - How to get rid of edges without losing detail?
on Jul 13, 2012 at 9:22:43 pm

Hey guys

We are having trouble with keying our original footage shot on Digital HD 1080i with Keylight on After Effects. As you can see in the images below, we have a live-action plate with superheroes and a very light digital background plate in a UFO.
We have tried out some Andrew Kramer tutorials, but the problem is as follows:
If we shrink our matte, we lose details, especially on the neck area of the red hero, which results in a deformation from the shoulders up. If we do not do that then we get a blue spill in that area.
We also tried to pre-blur the matte, but then the edges around the actors got too soft and seem unrealistic as well.

We have achieved good results on the other areas but it's always with a tradeoff: If the body is good, the neck area is bad and the other way around.
Also using the clip-black/clip-white settings seem unhelpful to cover all areas.
Additionally we want to keep the shadows that are cast on the bluescreen floor.

So here are our questions:

Is there any way to optimise the picture before we go into the keying process?

Is there anything we missed in our efforts? Could you direct us to another good tutorial that focuses on how to retain detail in the edge area?

We would be grateful someone would share some of his or her expertise in that area.

Best wishes
Pete and Torsten









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