Different brightness of the scene using mask

Hi guys,

This is probably a simple question but unfortunately I can`t find any info

Here is what I want to achieve

I tried to do this in post processes material using different image adjustments node, but without success
The only node that do the job was 3PointLevel but if I use it, I get black/white version of the scene

Any ideas?

Try translucent/additive rendering with mesh and use SceneColor and output that to emissive with some multiplier.

Works perfect!