I used monochrome mode to change the pub sign to DTA
When choosing a bounding box like this (without the sign) :
And applying the BG, it will aplly the BG to the background color (black) of the RAW frame as if the bouding box was a rectangle (withouth the hole in it that I made for the sign)
Here's a bug on the usage of BG feature :
Raw frame :
Pay attention to the PUB sign
Colored frame :
I used monochrome mode to change the pub sign to DTA
When choosing a bounding box like this (without the sign) :
And applying the BG, it will aplly the BG to the background color (black) of the RAW frame as if the bouding box was a rectangle (withouth the hole in it that I made for the sign)