Regarding object luminescence

1.I am looking for a chroma key method for video work.
In vray it is possible for an object to be emitted and not affect its surroundings.

Even in d5render, if it is possible to not affect the surroundings after the object is emitted. A trick similar to chroma key seems possible.

2.Like d5render lighting, I want to be able to adjust the reflection of object lighting.

-We also need the ability to apply opacity to bitmaps.
For example, I want to put a specific image opaque in a glass map.