color separation

(redirected from Colour separation)
Also found in: Dictionary, Wikipedia.
Related to Colour separation: Four color printing, Four color process

color separation

[′kəl·ər sep·ə′rā·shən]
(graphic arts)
The process of preparing a separate drawing, engraving, or negative for each color required in the reproduction of a colored picture.

Color Separation


in photography, the separation of radiation of complex spectral composition, emitted or reflected by a photographic or cinematographic subject, into several spectral bands corresponding to the spectral sensitivity regions in the primary layers of a multilayer color photographic material. The number of bands is equal to the number of primary layers, usually three.

Color separation is the first stage in the color photographic process; it produces a set of monochromatic images on a multilayer material. In color printing, the images are produced on individual photosensitive layers and are called color-separated negatives. Ideally, the entire spectral region of the light from the subject is separated into bands that border on each other but do not intersect and that correspond exactly to the spectral characteristics of the primary layers. In practice, however, color separation is always carried out by means of selectively absorbing media (dyes in the primary layers of a photographic material and light filters in the form of colored glass or tinted films), and it inevitably proves to be slightly different from the ideal; for example, the transmission bands may intersect, or the spectral characteristics may not coincide exactly. As a result, distortions in color reproduction occur in the final image; moreover, these distortions theoretically cannot be eliminated during subsequent stages in the color photographic process.


Artiushin, L. F. Osnovy vosproizvedeniia tsveta v fotografii, kino i poligrafii. Moscow, 1970.


color separation

Separating a picture by colors in order to make negatives and plates for color printing. The four-color process requires four separations: cyan, magenta, yellow and black (CMYK). See OPI and DCS.

Color Separated
The separations are printed individually in this picture to show how each of the four inks contributes to the total image. Typically, separations are put on film, and the printing plates are made from the film. (Image courtesy of Intergraph Computer Systems.)
References in periodicals archive ?
Key functions include design, repeating, colour separation, stepping and trapping, colouring, texture mapping as well as simulation, calibration of colours and raster graphs in one integrated but modular software package.
The colour separation process suited Dulac's talents particularly well, as it allowed accurate reproduction of subtle nuances of colour.
Unfortunately, 24 years on, it's obvious it was all done by wires and colour separation.
Vendor must be able to provide amendments, without additional charge, to the concept, design, artwork, colour mockup, typesetting, colour separation with full coloured printing, packing and delivery.
Vendor must be able to provide unlimited concept, design, artwork, colour mockup, typesetting, colour separation with unlimited full coloured printing, packing and delivery.
FFP worked closely with repro supplier Itarus to ensure that the colour separations accurately preserved the Whitworths brand identity.