Isle of Destiny (1940)
Isle of Destiny is a 1940 American South Seas comedy adventure film directed by Elmer Clifton. The film was the only feature film filmed in the Cosmocolor process (the 1938 A Western Welcome being a short subject) with prints struck by Cinecolor. The film was shot on Santa Catalina Island, California and produced by Franklyn Warner originally for Grand National Pictures in 1939. However, by the time of the film's production, Grand National had gone bankrupt, and so RKO bought the distribution rights to the film.
More at Wikipedia.