Xerox 560 composite file, composite mode, contrast, conventional screening, creep, CT file format

144 Chapter 15—Glossary

composite file

A single file—for example, a composite PostScript file or a PDF file —that contains all the color information and is not divided into color separations. That is, the color information is not divided into cyan, magenta, yellow, black, or spot colors.

composite mode

A mode of operation in which all the color information associated with a particular page is described on one page of a PostScript file. During RIP, the file is separated into process colors and spot colors, one file for each color. This mode of operation is the fastest and most efficient in most cases.

contrast

The ratio between the light tones and the dark tones in an image. If you increase the contrast, highlights become lighter while shadows become darker.

conventional screening

A method of screening in which an image is broken down into a series of dots of varying sizes that are placed in a rigid grid pattern. Color images are separated into the four process colors, and individual screens of color are created and then skewed at angles to reproduce the image in print.

creep

The extension of middle pages of a folded signature slightly beyond outside pages. Shingling compensates for creep.

CT file format

A four-color (CMYK) continuous-tone (or contone) raster file format. Gradient tones and continuous-tone data are sometimes converted to CT format.

database

A software module that holds site configuration information, edition plan information, and the current state of each process and planned item. At least one workstation at each site must have a database installed.