C
coaxial cable
An electrical cable that is a single-center, copper wire surrounded by a woven metal shield. The shield acts as the second single carrier to complete a loop. Coaxial cable is used for some types of EtherNet networks.
CODEC
Compression/decompression, enCOder/DECoder scheme that reduces the number of bits required to represent data during transmission and storage. Then, restores the compressed data for accurate representation of the original. For example, the MPEG codec can compress video for transmission and storage, and then decompress it for on screen display.
collate
The assembly of signatures or sheets in reading sequence for binding
collimated A characteristic of a beam of light from a point source an infinite length away such that every light ray in the beam is parallel to each other
colon
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Color Key
An overlay color proofing system. A proof is made by exposing the negatives to this proofing material, processing, then reassembling on a sheet of paper. The colorant is on the sheet, so one needs one of each for a cmyk proof. some spot colors are available as well. The name is a trademark currenly held by KPG.
colorimeter
An instrument for measuring the tritimulus values of color with a precise and defined response that is similar to the human eye. A densitometer can measure color strength, but is not a reliable indicator of color hue. Densitometers measure through separation filters which do not match the human visual response.
colorimetry
The science of color measurement
ColorStudio
A software program for the Macintosh that is used for image capture, rtouching, color correction and color separation, published by Letraset.
color
The physiological sensation of different wavelengths of the electromagnetic spectrum on the eye (the effect is actually a lot more fun than its description)
color balance
Maintaining the ratio of cyan, magenta, and yellow ink during printing. This will keep all color hues consistent and produce a picture with the desired color, one without an unwanted color cast or color bias.
color bars
Carried on all four-color process jobs to show the amount of ink used, the trapping, and the relative densities across the press sheet. A guide for the platemaker and the pressman.
color break
The process of dividing a monochrome representation of a page so that the appropriate areas will proof or print in the appropriate color.
color calibration
A procedure to standardize a video monitor, input scanner or output color printer to standard set of values so that WYSIWYG (What You See Is What You Get).
color cast
An unwanted overall discoloration of an original copy, color proof or reproduction caused by an overabundance of one color pigment or light. Colour casts result in bluish red, pinkish blue, etc. reproduction. The color cast can be digitally altered during or after scanning by using gamma correction.
color chart
A printed array of color patches that are used to choose, communicate and match colors. The color of each patch varies, one from another, and is made to given amounts of cyan, magenta, yellow and black inks or of premixed colors.
color compression
- The shrinking of the color gamut of an original copy to a color gamut reproducible with a given ink, selected paper and printing press configuration.
- A technique to reduce the amount of data in a color image file by removing large amounts of redundant data.
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