Enable "deep color" rendering (30 bit-per-pixel / 10 bit-per-channel and beyond)
As seen in the attached image, we can see the transitions between the different grays that occur with a 24bits-per-pixel screenshot export of ParaView. While most image editing software and printer support 32bits-per-pixel such as Ms Paint and Photoshop.
Most GPU manufacturers call that “deep color”. Some display already have 30bpp/10bpc.