Karel attended the Zlin factory school.
After receiving a basic education, Karel worked as an assistant in the graphic workshop for advertising drawings in the shoe factory of Bafa in Zlin, Czech, from 1938 to 1939. At this time he began photography, and on returning to Prague worked in theater and motion picture publicity.
Ludwig was known for his nudes, according to Petr Tausk. Also, an outstanding portraitist, he was one of the genre's most important representatives in the 1940s in Czech. Recently a portfolio of his work was published in Prague.