Pel·lícula de 35 mm: diferència entre les revisions

In the Conventional motion picture format, frames són four perforations tall, with an [[aspect ràtio]] of about 1.37:1, 22 mm by 16 mm (0.866 "x 0.630"). This is a derivation of the aspect ratio and frame size designated by Thomas Edison (24.89 mm by 18.67 mm or 980 "by 735") at the dawn of motion pictures, which was an aspect ràtio of 1.33:1 .<ref>{{ref-llibre|nom= John|cognom= Belton|títol = Widescreen Cinema|lloc = Cambridge, Massachusstes|publicació = Harvard University Press|any = 1992|pàgines = 17-18|isbn = 0 - 674-95261-8}}</ref> The first sound features were released in 1926-1927, and while [[Warner Bros]] was using synchronized Phonograph discs, [[Fox Film Corporation|Fox]] placed the soundtrack in an optical rècord directly on the film, on a strip between the sprocket holes and the image frame."<ref name="early sound"> Dibbets, Karel. "The Introduction of Sound". '' The Oxford History of World Cinema ''. Oxford University Press: Oxford, 1996. </ref>Sound-on-film" was soon adopti per l'other Hollywood studios. This result in an almost square image ràtio. To restore a més rectangular image ràtio, in 1932 the picture was Shrunk slightly vertically (with the line between frames thickened). Hence the frame became 22 mm by 16 mm (866 "by 630") with an aspect ràtio of 1.37:1. This became known as the "[[Academy ràtio|Academy]]" ràtio, named so after the [[Academy of Motion Picture Arts and Sciences]].<ref name="1.37"> Hummel, Rob (ed.). '' American Cinematographer Manual '', 8th edition. pp. 18-22. ASC Press: Hollywood, 2001. </ref> although, since the 1950s the aspect ratio of theatrically released motion picture films has been 1.85:1 (1.66:1 in Europe) or 2.35:1 (2.40:1 after 1970), sota the "Academy" ràtio was relegated to ús primarily for televisió. The image area for "TV transmission" is slightly smaller than the full "Academy" ràtio at 21 mm by 16 mm (0.816 "by 0612"), which is an aspect ràtio of 1.33:1. Hence the "Academy" ràtio is often mistakenly referred to as having an aspect ràtio of 1.33:1, enviant to the TV Transmitted area, instead of the actual 1.37:1 ràtio of the full "Academy" area.<ref name = "1.37 "/>

Durant la dècada dels 90 es van introduir fins a 3 sistemes digitals de so per la pel·lícula de 35&nbsp;mm: El [[Dolby Digital]], que s'emmagatzema entre les perforacions del film, l'[[SDDS]], situat en dues línies redundants pels marges de la pel·lícula passades les perforacions, i finalment el [[DTS HD|DTS]] en el qual la informació de so s'emmagatzema en discs compactes per separat que es llegeixen a través de la línia dels temps. Com que tots aquests formats poden aparèixer en diverses parts del film, una pel·lícula pot contenir-los tots, permetent una millor distribució per totes les sales.