Laboratory

The exposed film is processed in laboratory and images are produced on the film. Often, specific instructions are given to the laboratory in order to change the look of the film. Hence, in traditional film production, the laboratory developing the film has an important function in realizing the tones according to the cinematographer's wishes.

Wikipedia [History of film technology - Wikipedia]

Wikipedia [Photographic processing - Wikipedia]

Kodak [History of Film | Kodak]