The great photographer Robert Frank once said, “Black and white are the colors of photography. To me they symbolize the alternatives of hope and despair to which mankind is forever subjected.” They are powerful words, with more meaning behind them than I’ll attempt to dive into here, but what Mr. Frank doesn’t touch on here is just how much more difficult black-and-white photography can be when you’re doing it right—particularly in the realm of portraiture. Much if not most of…