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Pad
To bind by applying glue along one edge of a stack of sheets.

Page count
Total number of pages, including blanks and printed pages without numbers.

Pages per inch
Number of pages per inch of thickness of a bound publication. Each sheet has two pages.

Pagination
Assembly of type with other line copy into page format. When done by hand, this is makeup or pasteup; when done electronically, it is computer aided pagination (CAP).

Pallet
Wooden platform used as a base for loading and moving paper and printed products.

Paper distributor
Merchant selling paper wholesale to printers and other buyers of large quantities.

Paper dummy
Unprinted sample of a proposed printed piece trimmed, folded, and, if necessary, bound using paper specified for the job.

Parchment
Paper that simulates writing surfaces made from animal skins.

Parent sheet
Paper distributor term for sheet 17 x 22 or larger.

Paste bind
To bind by adhering sheets with glue along the fold of the spine.

Paste up
To adhere copy to mounting boards and, if necessary, overlays so it is assembled into a camera ready mechanical.

Pasteup
The process of pasting up. Also, alternate term for Mechanical.

Percentage wheel
Alternate term often used for Proportional scale.

Perfect bind
To bind sheets by trimming at the spine and gluing them to a paper cover

Perfecting press
Press capable of printing both sides of the paper during a single pass.

Photocopy
Method of printing that transfers images electrostatically and creates them on paper with powder bonded by heat.

Photosensitive
Characteristic of paper, film, and printing plates coated with light-sensitive chemicals.

Photostat
Process used to make positive paper prints of line copy and halftones. Often used as alternate term for PMT.

Picking
Undesirable phenomenon of bits of fiber or coating coming loose from paper during printing.

Pigment
Finely-ground particles giving color and opacity to ink.

Pinholes
Tiny holes in the emulsion of negatives or printing plates.

Pixel
Short for picture element, referring to a part of a dot made by a scanner or other digital device.

Plate
See Printing plate.

Plate cylinder
Cylinder of a press on which the printing plate is mounted.

Platemaker
In quick printing, process camera that makes plates automatically after photographing mechanicals. In commercial printing, machine used to expose plates from flats.

Platen press
A letterpress that opens and closes like a clamshell.

Plate-ready film
Alternate term for Flat.

Pleasing color
Color that is satisfactory even though it doesn't match original samples, scenes, or objects.

Plugged up
Undesirable characteristic of printing when ink fills in around halftone dots, causing loss of shadow detail.

PMS
Abbreviation for PANTONE MATCHING SYSTEM, a check standard trademark for color reproduction and color reproduction materials owned by Pantone, Inc.

PMT
Abbreviation for photomechanical transfer, a Kodak trade name for a process used to make positive paper prints of line copy and halftones.

Point
In paper, unit of thickness equalling 1/1000 inch. In typesetting, unit of height equalling 1/72 inch.

Portfolio
Collection of best work by an artist, photographer, or designer for showing during meetings with prospective clients.

Position stat
Photocopy or PMT made to size and pasted to a mechanical showing how to crop, scale, and position loose art or photos.

Positive
Characteristic of an image on film or paper in which blacks in the original subject are black or opaque and whites in the original are white or clear.

PPI
Short for pages per inch.

Preparation
Camera work, stripping, platemaking, and other activities by a trade camera service or printer before press work begins. Also called prep.

Prepress
Alternate term for Preparation.

Preprint
To print work in advance to be ready for inserting or imprinting.

Press check
Event at which test sheets are examined before production run is authorized to begin.

Press proof
Proof made on press using the plates, paper, and ink specified for the job.

Press run
The number of pieces printed.

Press sheet
One sheet as it comes off the press.

Price break
Quantity level at which unit cost of paper or printing drops.

Printer
In printing trade, person who owns or manages print shop or runs printing press. In 4-color process printing, one of the separation negatives.

Printing
Any process that repeatedly transfers an image from a plate, die, negative, stencil, or electronic memory.

Printing plate
Surface carrying image to be printed.

Printing trade customs
See Trade customs.

Process blue
Alternate term for Cyan.

Process camera
Graphic arts camera used to photograph mechanicals and other camera-ready copy.

Process colors
The colors needed for 4-color process printing: yellow, magenta, cyan, and black.

Process inks
Inks in the four process colors.

Process printing
Alternate term for 4-color process painting.

Process red
Alternate term for Magenta.

Production artist
Person who does pasteup.

Prog
Short for Progressive proof.

Progressive proof
Press proof showing each color of a job separately or several colors in combination.

Proof
Test sheet made to reveal errors or flaws, predict results, and record how a printing job is intended to appear.

Proof OK
Customer signature approving a proof and authorizing the job to advance to the next stage.

Proofread
To examine copy or a proof for errors in writing or composition.

Proof sheet
Photographer term for sheet of images made by contact printing negatives.

Proportional scale
Device used to calculate percent that an original image must be reduced or enlarged to yield a specific reproduction size.

Publish
To produce and sell or otherwise make available printed communication to the public.

Pulp
Mixture of wood and/or cotton fibers, chemicals, and water from which mills make paper.