Kara Kum was one of the most exploitative magicians of the 1950s, relying in sex, celebrities, and scares to sell his minor-league spook show.
For what it's worth, this dude's claim is that, for a similar trick "teleporting" Elvis back from Germany, Kum used a high-contrast negative image that the audience would focus on, then flipped off the lights to cause a ghost image to appear.
His 'resurrections' were just typical costume and assistant changes from cabinets (coffin in the case noted). He is mentioned several times in material I obtained from magician Wally Jay's personal collection, so sadly dispersed. If I were a billionaire I would crate a fund to purchase such private collections complete and house them at the Magic Castle.
The question of using images of past celebrities was renewed with digital recreations for commercial use.