Photographic
Sound Negatives
Photographic sound negatives (variable area) are
processed to a particular gamma and density to provide
minimum cross modulation distortion when printed
to a certain positive aim density. The photographic
sound negative gamma and density and the print density
will be different for each type of release print
raw stock used. Photographic sound positives are
required for making black and white reversal composite
prints. You must be
sure, when ordering photographic sound negatives
or positives, that you specify the correct type
for the intended use, and that in 16mm, you specify
the correct emulsion position, or "wind,"
to match the wind of the picture material it will
be printed with. If you have any doubts, check
with your ACVL lab and tell them what the finals
use of the sound will be. They will help you pick
the proper combination. topˆ
Sound
Overlaps
In 35mm prints, sound overlaps are required at
the roll changeover in theatrical projection.
(Ref: ANSI PH 22.55). Whenever composite prints
are made in multiple reels, where these reels
might be splices together for projection, a sound
overlap is required of the print at the end of
the reel being spliced onto the head of the next
reel. This overlap contains the sound information
of the advance of the next reel (26 frames in
16mm and 20 frames in 35mm).
Magnetic
Dubbing Masters
Magnetic dubbing masters are used when transferring
sound onto magnetic striped prints. This is most
common in Super 8 release printing. These should
be splice-free and are frequently made on polyester-based
magnetic stock for longer life. topˆ
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