The BCC Alpha Spotlight filter uses a spotlight to create or add
transparency to the source image. For example, you can use Alpha Spotlight to
create an effect in which the lit areas become transparent while the
background is left opaque, or vice versa.
[To learn more about this filter, and see a breakdown of the various controls,
please click here.](https://www.borisfx.com/helpdocs/?page_id=198 “BCC Alpha
Spotlight Help Documentation” )