I came accross this problem with the On The Buses TV series.
On some of the Black & White episodes there is a rainbow coloring effect that is
very off putting. So i needed to remove it…Nothing in TOPAZ to do that.
In this case MKV encoding was not possible…I used Handbrake, it has a
Greyscale (Black & White) output setting…Check out the stills…I Also used to other filters…See the stills.

Now i can input into TOPAZ With The Interlaced Setting, This remove any lines left behind by Handbrake.

With MakeMKV

This would be a great feature request, would you mind if I moved it to the Idea’s forum? Or is the rainbow effect being introduced by TVAI?

Yes…Move it if you want.