2. Professional cinema standard formats

Traditional or professional cinema, as we know it today, has been developed since the birth of the cinematograph. It is based on internationally established principles and standards. The term "format" can refer to both :

the type of film, considered solely from the point of view of its geometric characteristics. The format is used to differentiate the various types of film by their width, shape and perforation spacing. Here, format is defined by film width, expressed in millimeters;
the ratio of image dimensions on the screen: for example, 1.65 × 1, usually abbreviated to 1.65 (pronounced "one sixty-five"), means that the image on the screen is 1.65 times wider than it is high.

Note :

This choice is made by the director or cinematographer,...

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Professional cinema standard formats

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Bibliography

References

(1) - AUMONT (J.), BERGALA (A.), MARIE (M.), VERNET (M.) - Esthétique du film. - Nathan (1983).
(2) - DAUMAS (M.) (sous la direction de) - Histoire générale des techniques, tome 5, Les techniques de la civilisation industrielle....

Standards

In France, the Commission Supérieure Technique de l'Image et du Son (CST), set up in 1944, acts as a technical advisor, official expert and national technical laboratory to the industry. It is also responsible, under the authority of the Centre National de la Cinématographie (CNC), for ensuring compliance with technical standards and specifications, with a view to issuing permits to technical industries (studios, laboratories,...