Photographic processing is the industrial process by which conventional photographic film
is treated after photographic exposure in order to produce the desired negative or positive image.
Photographic processing does three things: it transforms the latent image into a
visible image that can be seen, it makes the visible image permanent, and it renders the
film insensitive to light.
The general process is similar whatever the make of film or paper. Although generally not considered
"conventional," exceptions include instant films such as Polaroid and thermally developed films.
Kodachrome cannot be processed except in Kodak laboratories. There are also a small number of relatively
uncommon processes using dye decomposition technologies such as Cibachrome.
In amateur processing, the film is removed from the camera and wound onto a reel in complete darkness
(usually inside a darkroom (with the safelight turned off) or a lightproof bag with arm holes).
The reel holds the film in a spiral shape, with space between each successive loop so the chemicals
may flow freely across the film's surfaces. The reel is placed in a specially designed light-proof
tank (called daylight processing tank) where it is retained until final washing is complete.
In case of sheet film, they can be processed in trays, in hangers (which are used in deep tanks),
or rotary processing drums.
|
|
Student Login
©
2007 Nasson Institute