Glossary A-M
Cellulose acetate
Manufactured in the 1920’s as diacetate cellulose and triacetate cellulose film base. The acetic acid is the result of acetate decomposition which produces a vinegar odor, this chemical deterioration is known as « vinegar syndrome ».
Cellulose nitrate
Nitro-cellulose base film, used mainly for 35 mm cinema film until the early 1950's. Instability chemical, it has not been produced due to its extreme flammability and its high fuel capacity.
Conservation
The action to store films in an archival environment with temperature and humidity control in order to ensure its physical survival. The conservation is the component of film preservation.
Copyright
The legal right given to a creator or an assignee of an artistic form.
Duplicate
Printed negative or positive from an original element.
Editing
Process of assembling sequences constituent of a cinematographic narration.
Emulsion
On a light-sensitive cinematographic medium a gelatin layer containing silver halides together with the base
Film
A thin, flexible, transparent sheet which bears a succession of images and sound content. By extension, the representation by means of motion pictures.
Film archive
An institution or organization dedicated to collecting and presersing moving image and sound materials on a permanent basis.
Frame
A single picture recorded on a motion picture film.
Gauge
The width of the motion picture film from edge to edge, expressed in millimeters. There are the 35mm (the most common), the 16mm (substandard), the small gauges as 9,5mm 8mm, super 8 or for wide screen, the 70mm.
Grading
A laboratory process of selecting suitable exposure and color values for printing a motion picture film
Internegative
An intermediate negative derived directly from a positive element. As a conservation master, it can be used for making new prints.
Interpositive
Low contrast positive printed on intermediate stock from which duplicate negatives may be printed.
Master
In the digital world, it is the reference element from which duplicates are to be made. In the analog world, it is synonymous of interpositive.