Academy ratio

Under the normal or the " Academy " movie image is defined as the motion picture in 1929 across rectangular presented by the Academy of Motion Picture Arts and Sciences, established for the normal film in the aspect ratio of 4 to 3 ( 1:1.333 ), from the format of the picture window of the cinema camera with picked out a mask. The aspect ratio of the camera image window is now 11 to 8 ( 1:1,375 ). 1932, the required dimensions 0.631 "× 0.868 " ( 16.0274 to 22.0472 mm). The " Academy " picture has backed down to half Tonspurbreite from the middle of the film as opposed to the frame of the silent film.

The small difference between the aspect ratios of 4:3 and 11:8 ( in a nutshell 32:24 and 33:24 ) is due to an uncertainty ago, which was then compared to the final width of the inserted audio track. In particular, we had to get on one of the two edges of some movie, to which the new dimensioning should refer. Because it seemed important to establish high accuracy for the sound track, the decision was made for the right edge of the film, from the results of the smaller distance to Tonspurmitte. The reason was simple: the vast number of cinema projectors were " legal machinery ", ie they are served from the right, and thus, the right edge of the film is exposed for the newly installed audio playback device.

Until the general recognition of the "Academy" standard and a standard sheet of the American Standards Association, the camera image window were partially soldered in practice. With some uncertainty as sound films were produced that allowed one nearer the square motion picture. However, it may be doubted whether appropriate changes to the image walls were performed. There was no cause to the public to present a new, narrower motion picture, as it was used already for 20 years. The titles that transitional period include, for example Vampyr - The Dream of Allan Grey by Carl Theodor Dreyer and Blackmail by Alfred Hitchcock.