APR - Automatic Picture Replacement. The replacement of a low resolution image by a high resolution image.
ASCII - American Standard Code for Information Interchange. A standard means of representing text as numerical data.
Accordion Fold - In binding, a term used for two or more parallel folds which open like an accordion
A/W - an abbreviation for Artwork.
Acetate - a transparent sheet placed over artwork allowing the artist to write instructions or indicate where second color is to be placed. See Overlay.
Addendum - supplementary material additional to the main body of a book and printed separately at the start or end of the text.
Additive color - in color reproduction, red, green, and blue. When lights of these three colors are added together, they produce the sensation of white light.
Ad rate card - a one sheet that lists your ad rates
Against the grain - At right angles to direction of paper grain.
Air (US) - an amount of white space in a layout.
Airbrush - a mechanical painting tool producing an adjustable spray of paint driven by compressed air. Used in illustration design and photographic retouching.
Align - to line up typeset or other graphic material as specified, using a base or vertical line as the reference point.
Alphabet (length or width) - the measurement of a complete set of lowercase alphabet characters in a given type size expressed in points or picas.
Alteration - Change in copy of specifications after production has begun.
Analog color proof - off - press color proof made from separation films. Includes overlay (such as Color Key) and laminate (such as PressMatch) proofs.
Anodized plate - an offset printing plate with a specially treated surface to reduce wear during printing.
antique finish - a term describing the surface, usually on cover papers, that has a rough, natural finish.
Apex - the point of a character where two lines meet at the top, an example of this is the point on the letter A.
Apron (US) - additional white space allowed in the margins of text and illustrations when forming a foldout.
Art - all illustration copy used in preparing a job for printing.
Artboard - Alternate term for mechanical art.
Art paper - a smooth coated paper obtained by adding a coating of china clay compound on one or both sides of the paper.
Art (US) - in graphic arts usage, all matter other than text material e.g. illustrations and photographs.
Ascender - any part of a lower case letter extending above the x-height. For example, the upper half of the vertical in the letters b or h.
Authors corrections - changes made to the copy by the author after typesetting but not including those made as a result of errors in keying in the copy.
Author's corrections - Also know as "AC's". Changed and additions in copy after it has been typeset.
AutoTrap - A software program that automatically applies trapping to film which is output by imagesetters. Trapping is the precise relationship between two ink colors when they butt together on a printed sheet. If no trap is added, a white gap may appear between colors. If too much trap is added, a dark line will appear where the colors overlap.
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