Question Is it possible to apply culling to an image effect that uses a command buffer?

Hey guys!

I'm using CommandBuffers for the first time to create an outline effect for a 2D game. It's exciting and I'm having lots of fun. This is how it works:

Unity draws transparents:


My command buffer draws an "OutlineMap" using a silhouette-only shader:


OnRenderImage in the camera applies the outline using the OutlineMap:


So far so good.
Now what I'd need is to cull the outline so, in the example above, it wouldn't be visible in front of the red-haired character. Would that be possible?

Thanks!