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© 2014 Digital Vision
UM-2014.1-07
Keycode
Keycodes sre numbers appearing on the edge of film, incrementing once per
foot, used to uniquely identify frames for negative cutting. Also known as
edgecodes, they are the film equivalent of timecode. The key numbers identify
certain traits of the film, including the manufacturer, the stock type, a prefix
identifying the roll and a footage count.
A keycode has a format : KZ 12 8506 2190 +05
where :
KZ
Manufacturer code - KZ is Kodak
12 8506
Prefix identifies film roll
2190
The count is 4 digits that increment once per foot (35mm film,
4 perf = 16 x 4 perfs per frame)
+05
Offset - how many perforations the frame is from the keycode
mark
Using the count and offset values we can calculate the frame location, as long
as we know how many perforations there are per frame and per count.
The DPX file format includes keycode in the file header.