Did I read this or did I make it up? Google fails me.
Typical alien invasion story written or set in fifties. Aliens send two-person scout craft ahead with aliens made to appear human based on received TV images. Scouts are immediately captured because they’re in “black and white” instead of actual living color.
I’m going to suggest Ron Goulart and Robert Sheckley as possible authors for this (I’d suggest William Tenn and Fredric Brown, too, but I think I’ve read all of theirs). Probably written sometime between 1950 and 1970, right?