<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["fr", "en"].<end_of_turn>
<start_of_turn>user
C'est quoi le Principe du CinémaScope?<end_of_turn>
<start_of_turn>model
Silver film was created in 1889 in 35 mm width with two rows of side perforations. Today, 35 mm remains the standard format, but others have been born, narrower like 8 mm and 16 mm, or wider like 70 mm. The panoramic image is not necessarily obtained with a wide film. The Vistavision, for example, only uses 35mm film, but the image fits along its length. The Cinemascope also uses 35 mm: when shooting, a vast field is filmed and a special lens, called an “anamorphoser”, compresses the image between the perforations; during projection, the same lens renders the image on a wide screen.
Cinema films are essentially negatives, intermediate films then allowing the printing of positive projection copies. Furthermore, filming is done today almost exclusively in color. All processes (Technicolor, Eastmancolor, Fujicolor, Gevacolor) are based on the same principle as photography: the superposition of three layers of emulsions sensitive respectively to red, green and blue.<end_of_turn><eos>