by When filmmaking was in its infancy, making transitions was a tricky prospect. You had to do it all “in the real world,” so to speak, by superimposing two projected videos and recording the result. Needless to say, it was hard work and only used in specific parts of the film — such as the end of a scene — but once the effect was done, it was done. If it was off by a few frames, unless you could afford to reshoot the transition, that was that.
