Apple M8728Z/A User Manual - Page 231
mm Film, Film Edge Code, Key Numbers
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35mm Film 35mm film has 64 perforations per foot. Cinema Tools supports the 4-perf 35mm and 3-perf 35mm formats for all types of film lists and change lists. These are by far the most common 35mm formats. The 4-perf 35mm film format has 16 frames per foot. The 3-perf 35mm format does not have a whole number of film frames in a foot (there are 21 and one-third per foot). To avoid tracking fractions of frames, the 3-perf 35mm format is considered to have a pattern of two 21-frame feet followed by a 22-frame foot. See 3-Perf 35mm Offsets for more information. Film Edge Code To aid in locating specific film frames, film manufacturers place numbers along the edge of the film. These key numbers (also known as latent edge code) appear when the film is developed. For workprints, film labs can add numbers called ink numbers (also known as Acmade numbers). Edge code is essential to your Cinema Tools database because it makes it possible for you to export cut lists or change lists that specify exactly where your negatives or workprints need to be cut in order to match your digital edits. Key Numbers Key numbers provide both an identification number for each roll of film and an incremental footage count number used to identify specific film frames. They often appear as both regular text and as a bar code. Key number Appendix A Film Background Basics 231