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Film, Darkroom & Historic Processes

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Film, Darkroom & Historic Processes

C-41 Process

The standardised chemical process for developing colour negative film.

3′15″ at 38 °C minutes at °C
Film, Darkroom & Historic Processes

Calotype

An early paper-negative process, patented by Fox Talbot in 1841, allowing multiple prints from one exposure.

Film, Darkroom & Historic Processes

Camera Obscura

A darkened room or box in which a small aperture projects an inverted image of the outside world onto an inner surface.

Film, Darkroom & Historic Processes

Characteristic Curve

A graph plotting a film's resulting density against the logarithm of the exposure it received.

D vs log H density vs log exposure
Film, Darkroom & Historic Processes

Chromogenic Black and White Film

A monochrome film that forms its image from dye couplers rather than silver, and is processed in standard colour chemistry.

ISO
Film, Darkroom & Historic Processes

Colour Negative Film

Film that records a colour image with tones and colours inverted, printed or scanned to produce a positive.

ISO
Film, Darkroom & Historic Processes

Colour Reversal Film

Film that produces a positive transparency directly, viewable and projectable without printing.

ISO
Film, Darkroom & Historic Processes

Contact Print

A print made with the negative in direct contact with the paper, producing an image the same size as the negative.

Magnification = 1:1
Film, Darkroom & Historic Processes

Contact Sheet

A print made by laying an entire strip or roll of negatives directly on paper, showing every frame at negative size.

Film, Darkroom & Historic Processes

Contrast Index

A measure of the average slope of a film's characteristic curve over the range actually used in practice.

CI
Film, Darkroom & Historic Processes

Cross-processing

Deliberately developing film in chemistry intended for a different process, producing extreme colour and contrast shifts.

Film, Darkroom & Historic Processes

Cyanotype

An iron-based printing process producing images in Prussian blue, developed simply by washing in water.