Quickie about keying

Compositing
1

Hi,

I'm doing a bit of keying at the moment and there are a few not so good shots of which I need to extract the actors from. I put a mask to the footage that only includes the actors and a bit of extra space and then used primatte to take out the blue.

Now, this results that I have a black rectangle surrounding the mask shape (in the output of primatte that is). So, I put the same mask to primatte as well. This gets rid of the black box but now I get artifacts along the edge of the rotoshape.

I've tried to mess with the soft edge (tryuing to remove it that is) but I do not seem to get this work for some reason. Any help from you pros?

2

Answering to myself... RTFM.

One way is to use sharpen node and put values like 128000 for the percentage and to the pixel values. The brighter choice is to use Inside node after the keyer.

3

I don't think you need to push the garbage matte into both the plate and Primatte. Just Primatte will do. This should eliminate the issue that you're having.

a

4

Thanks, that seemed to work too once the mask was inverted. Three ways to do it now.