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Aliasing
A "staircase" or jagged effect that occurs when display resolution is too coarse to minimize the broken or crooked appearanceof certain electronic design elements. Aliasing is more visually pronounced in diagonal lines, c u rve s , and circles.

Aqueous Coating
Water-based coating applied like ink by a printing press to protect and enhance the printed surface.

Ascender
The part of a lower case letter which rises above the main body, as in "b" or "d."

Blanket
In offset printing, a rubber-surfaced fabric that is clamped around a cylinder. The image is transferred from the plate tothe blanket, and from there, transferred to the paper.

Bleed
Printed image which extends beyond the trim edge of the sheet or page.

Cast Coated Paper
Paper dried under pressure against a heated, polished cylinder to produce a high-gloss enamel finish.

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

Coated Paper
Paper with a coating of clay or other substances that improves reflectivity and ink holdout.

Color Key.
3M’s negative overlay proofing films which visually simulate process printing inks.

Color Separations
The four-color negatives or positive that are the result of changing full color photos or art into the four process colors (see CMYK) by the use of filters.

Computer-to-plate (C2P)
Describes a system in which the use of desktop publishing software, electronic prepress workstations, and platesettersallows the imaging of metal plates for any format of press without the use of film, stripping, or traditional platemaking.This process results in lower costs while shortening the amount of time needed to get a job on the press. Sometimes also called C2P to distinguish it from CTP, or computer-to-press.

Computer-to-press (CTP)
Describes a printing system that includes desktop publishing software, electronic prepress workstations, and a new typeof press which is capable of rapidly changing the images it is printing without the use of removable plates. Sometimescalled CTP to distinguish it from C2P, or computer-to-plate.

Coverage
The amount of ink on a page or sheet, usually given in percentages.

Crop Marks
Symbols placed in the margin outside the image area that indicate to the printer and bindery the area to be printedand/or trimmed from the final image.

Curl
The distortion of paper due to differences in structure or coatings from one side to the other or from absorption ofmoisture on the press.

Descender
The part of a lower case letter which extends below the main body, as in "p."

Die
Device for cutting, scoring, stamping, embossing, or debossing.

Die Stamping
Printing from lettering or other designs engraved into copper or steel. Also called the intaglio process, it is used for theproduction of letterheads, business cards, etc.

Diecutting
Using sharp steel rules to cut special shapes from printed sheets. Diecutting can be done on either flatbed or rotary presses.

Dot Gain
The increase in the printing dot size from the halftone film to the printed substrate resulting in darker tones.

Drawdown
Sample of inks specified for a job applied to the substrate specified for a job.

Drop Out
The technique that can give a mediocre photo greater contrast by photographically removing some dots to create highlights that show the actual white of the paper.

Duotone
Two films are made by changing the screen angle for each, and one plate is made for each film. A duotone is printed in two colors, but both plates can be used for the same color ink for maximum contrast. When using black ink this is called a "double black."

Em
A measure of space exactly as high and wide as the point size of the type face being used.

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