During todays launch of ULA's GOES-S, the public NASA TV coverage showed the rocket during its ascent, filmed from earth. Sometimes, the image changed to a more coarse grained black and white image, then changed back to a color image. The commenters never mentioned a reason. Was that an infrared or RADAR image so clouds or similar obstructions could be penetrated?
See for example Nasa LIVE LAUNCH: GOES-S Launch Coverage - Kennedy Space Center between
and 08:00; you can also click the screenshots below for full size.