As per the title cards preceding the feature:

The image was digitized from the oldest available print preserved in the National Film Archive in Prague. Neither the original camera negative nor any period prints have survived to this day.

The look of the digitized film is limited by the condition of the print which was used as the main source material. This print was struck in 1950s, with new intertitles. A complete removal of the visual wear and tear would have endangered the integrity of the film's image. Also, various features that originate from the shooting of the film or its laboratory processing have been preserved and are evidence of the technologies and creative approaches of the time.