A substantial part of the film was to be shot on location in Granada, Seville and the Sierra Nevada, and filming began in March 1921. For the first time ever, permission had been granted for a film company to shoot inside the
Alhambra palace and L'Herbier gave prominent place to its gardens, fountains and geometric architectural patterns. These became some of the film's most memorable images. During the approach to Easter, he also seized the chance to film the spectacular
Holy Week processions which took place in Seville and to incorporate this documentary footage within the fiction of his story. The interiors were subsequently filmed at the Gaumont studios in Paris at Buttes-Chaumont. With his principal cameraman Georges Lucas, L'Herbier created a number of optical effects during filming. When Sibilla is first introduced among the other dancers on stage, a partial blurring of the image places her out-of-focus while those around her are sharply defined, an effect repeated in her subsequent dance to suggest that she herself is not fully focussed on her surroundings because her mind is preoccupied with the plight of her son. Distortion of close-up images of customers in the cabaret reflect their intoxication and lust. A similar technique is used later to introduce a note of visual horror into the scene when Joao tries to rape Sibilla. A different use of optical distortion in the scenes of Hedwick at work in the Alhambra shows how the actual settings of his paintings are transformed in the painter's imagination. L'Herbier was at pains to draw a distinction between his approach and that used in
The Cabinet of Dr. Caligari (1920) in which visual distortions are incorporated into the design of the sets - which were then photographed normally. In
El Dorado it is the camera itself which is used to shape the images seen by the viewer. These uses of semi-subjective camerawork have been one of the most discussed aspects of the film in subsequent criticism. L'Herbier was an ardent advocate of colour
tinting of the finished photographic image, and he devised an elaborate scheme of colouring to enhance the effect of different scenes and shots, and sometimes to clarify the shift between the present and a past flashback. (A surviving print held by the Cinémathèque Française preserves these tinted effects.) L'Herbier regarded the musical accompaniment of a film as being supremely important, and in
El Dorado he sought to produce a closer integration between image and music than had been achieved before. He commissioned the young composer
Marius-François Gaillard (who was only 21) to compose an orchestral score which was based upon the final cut of the film. This allowed the music to be precisely synchronised with the action of the film instead of the rather approximate playing of 'mood music' which was then common practice. L'Herbier claimed that this was the first time that an exactly synchronised orchestral score had been written for a film, and although full scores for films had been previously produced in Europe and USA, this was at least a pioneering example of music written as an exact counterpoint to the image. L'Herbier enjoyed complete artistic freedom during filming but his relations with his producer Léon Gaumont deteriorated as the schedule and the budget both exceeded expectations. Gaumont was not impressed by the 'artistic' visual devices of blurred and distorted images. When the film was first shown to him, he angrily interrupted the screening to demand that the projectionist should correct his equipment, and he was scarcely mollified when it was explained that these were a deliberate part of the director's vision. ==Reception==