C1S and C2S
Abbreviations for coated one side and coated two sides.

Carbonless Paper
Paper coated with chemicals that enable transfer of images from one sheet to another with pressure from writing or typing.

Case
Covers and spine that, as a unit, enclose the pages of a casebound book.

Case Bind
To bind using glue to hold signatures to a case made of binder board covered with fabric, plastic or leather. Also called cloth bind, edition bind, hard bind and hard cover.

CMYK
Abbreviation for cyan, magenta, yellow and key (black), the four process colors.

Coated Paper
Paper with a coating of clay and other substances that improves reflectivity and ink holdout. Mills produce coated paper in the four major categories cast, gloss, dull and matte.

Collate
To organize printed matter in a specific order as requested.

Color Balance
Refers to amounts of process colors that simulate the colors of the original scene or photograph.

Color Control Bar
Strip of small blocks of color on a proof or press sheet to help evaluate features such as density and dot gain. Also called color bar, color guide and standard offset color bar.

Color Correct
To adjust the relationship among the process colors to achieve desirable colors.

Color Electronic Prepress System
Computer, scanner, printer and other hardware and software designed for image assembly, color correction, retouching and output onto proofing materials, film or printing plates. Abbreviated CEPS.

Color Separation
(1) Technique of using a camera, scanner or computer to divide continuous-tone color images into four halftone negatives. (2) The product resulting from color separating and subsequent four-color process printing. Also called separation.

Color Sequence
Order in which inks are printed. Also called laydown sequence and rotation.

Color Shift
Change in image color resulting from changes in register, ink densities or dot gain during four-color process printing.

Color Transparency
Film (transparent) used as art to perform color separations.

Comb Bind
To bind by inserting the teeth of a flexible plastic comb through holes punched along the edge of a stack of paper. Also called plastic bind and GBC bind (a brand name).

Commercial Printer
Printer producing a wide range of products such as announcements, brochures, posters, booklets, stationery, business forms, books and magazines. Also called job printer because each job is different.

Contrast
The degree of tones in an image ranging from highlight to shadow.

Cover
Thick paper that protects a publication and advertises its title. Parts of covers are often described as follows: Cover 1=outside front; Cover 2=inside front; Cover 3=inside back, Cover 4=outside back.

Coverage
Extent to which ink covers the surface of a substrate. Ink coverage is usually expressed as light, medium or heavy.

Cover Paper
Category of thick paper used for products such as posters, menus, folders and covers of paperback books.

Creep
Phenomenon of middle pages of a folded signature extending slightly beyond outside pages. Also called feathering, outpush, push out and thrust. See also Shingling.

Crop Marks
Lines near the edges of an image indicating portions to be reproduced. Also called cut marks and tic marks.

Crossover
Type or art that continues from one page of a book or magazine across the gutter to the opposite page. Also called bridge, gutter bleed and gutter jump.

Cutting Die
Usually a custom ordered item to trim specific and unusual sized printing projects.

CWT
Abbreviation for hundredweight using the Roman numeral C=100.

Cyan
One of the four process colors. Also known as process blue.