Alembic Color Correction

Hello everyone ... I'm trying Fusion 8 BETA and I have a problem with color correction on an imported from Maya animation in the alembic format.
I can not correct the color and create a soft edge. How can I do?

Thank you

Can you give us more information of what you're trying to do? you can add masks to a color correction node, or you could use volume mask if you have the world position pass available.

So, I'm trying to create a compositing between still image and the flag on the move. for the movement I have no problems, I created the shaders the lights etc. I would like to make it more credible so I try to correct chromatically the flag.
But I do not know go ahead and I'm stuck. These my nodes:

With an Alembic import, can make position passes as needed.

sorry guys, but I'm going crazy, I can not create a mask from merge3d to correct the alembic.
Help me pls

You could split your scene into 2 separate renders, and mask in 2D.

If you have Fusion Studio, you can mask in 3D.