C
Symbol for cyan in four-color printing.

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

Caliper
(1) Thickness of paper in thousandths of an inch (mils or points), pages per inch (ppi), thousandths of a millimeter (microns) or pages per centimeter (ppc). (2) Device on a sheetfed press that detects double sheets or on a binding machine that detects missing signatures or inserts.

Camera-Ready Art
A file which is print ready.

Case Binding
A hardback book made with stiff outer covers. Cases are usually covered with cloth, vinyl or leather.

Cast Coated
Coated paper with a high gloss reflective finish, usually on one side only. 

Choke
Technique of slightly reducing the size of an image to create a hairline trap or to outline. Also called shrink and skinny.

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 four major categories: cast, gloss, dull, and matte.

Coil Binding  
Binding with a metal or plastic wire spiraled through holes punched along the side of a stack of paper. Commonly used for reports, proposals and manuals. Documents bound with coil have the ability to lay flat and can rotate 360 degrees. Also called spiral binding.

Collate 
Gathering separate sections or leaves of a book together in the correct order for binding.

Color 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 control bar, color guide and standard offset color bar. Color bars are printed on proofs and forms to maintain color consistency.

Color Matching System
A system of formulated ink colors used for communicating color. 

Color Separation
The processes of separating the primary color components (CMYK) for printing.

Comp
Simulation of a printed piece complete with type, graphics and colors. Also called color comprehensive or comprehensive dummy.  

Continuous-Tone
All photographs and those illustrations having a range of shades not made up of dots, as compared to line copy or halftones. Abbreviated contone.

Contrast
The range of differences between the lightest and darkest colors in an image.

Converter
Business that makes products such as boxes, bags, envelopes and displays.

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

Cover Parts
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.

Creep
Creep is the shifting position of the page in a saddle-stitched bind. Creep moves the inside pages away from the spine. Also called feathering, outpush, push out and thrust. Also see: Shingling.

Crop
To reduce the size of an image.  It also refers to trimming off excess or unnecessary detail in an image.

Crop Marks
Printed lines showing where to trim a printed sheet. 

Crossover
Printing 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.

Cure
To dry inks, varnishes or other coatings after printing to ensure good adhesion and prevent setoff.

Cut Sizes
Paper sizes used with office machines and small presses.

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

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