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A bunch of data.  Packet switching is a system that breaks data into small packets and transmits each independently.  The receiving computer has to combine all the packets.
In printing press, paper used to underlay the image or impression cylinder in letterpress, or the plate or blanket in lithography, to get proper squeeze or pressure for printing.
Page Buffering:
The ability to spool an entire image to disk and print in a continuos motion.
Page Description Language:
(PDL) In digital prepress, a computer language designed for describing how type and graphic elements should be produced by output devices.
Page Makeup:
In stripping, assembly of all elements to make up a page.  In digital imaging, the electronic assembly of page elements to compose a complete page with all elements in place on a video display terminal and on film or plate.
In computerized typesetting, the process of performing page makeup automatically.
Paint Program:
A program that allows you to create graphic objects that consist of a series of dots.
The collection of colors or shades available to a graphic system or program.
Photographic film sensitive to all visible colors.
Paper Master:
A paper printing plate used on an offset-duplicator.  The image ins made by hand drawing, typewriter or electrophotography.
Paste Drier:
In inkmaking, a type of drier, usually a combination of drying compounds.
See Line Art or Camera Ready Art.
Patterned Gummed:
See Adhesive Pattern Gummed.
(Portable Document Format) A proprietary format for the transfer of designs across multiple computer platforms.  PDF is a universal electronic file format, modeled after PostScript language and is device- and resolution-independent.  Documents in the PDF format can be viewed, navigated and printed from any computer, regardless of the fonts or software programs used to create the original.
(Portable Document Format Exchange) A PDF subset that allows exchange of all composite data with all the elements necessary for final print reproduction.
Perfect Binding:
An inexpansive bokbinding technique in which the pages are glued rather that sewn to the cover and used primarily for paperbacks, small manuals, phone books, etc.
Perfecting Press:
A printing press that prints both sides of the paper in one pass through the press.
Refers to a series of small cuts made in a material to assist tearing or folding.
A connectable device that has an auxiliary function outside of the permanent system configuration.
A number used for expressing the acidity or alkalinity of solutions.  A value of 7 is neutral in a scale ranging from 0 to 14.  Solutions with values below 7 are acid, above 7 are alkaline.
In digital imaging, materials used in electrophotography that are light sensitive when charged by corona.
Pertaining to any platemaking process using photographic negatives or positives exposed onto plates or cylinders covered with photosensitive coatings.
Photopolymer Coating:
In photomechanics, a plate coating consisting of compounds that polymerize on exposure to produce tough abrasion-resistant plates capable of long runs, especially when baked in an oven after processing.
Printer's unit of measurement used principally in typesetting. One pica equals approximately 1/4 of an inch.
Picker's Curl:
The curl or bend in the face material caused by the end user sharply peeling label from liner vs. liner from label. This becomes more noticable and problematic with larger labels.
The lifting of the paper surface during printing.  It occurs when pulling force (tack) of ink is greater than surface strength of paper.
In digital imaging, a standard data format for Macintosh systems to store object-oriented images using QuickDraw.
This involves a pressure sensitive label on a pressure sensitive liner (or midliner) which is placed on a carrier or base liner. This is commonly referred to as two labels on one liner. Often this is used with customer response cards. The two labels are removed and applied as one. The end user will generally then remove the top label.
The fine solid particles used to give printing inks color, transparency or opacity.
In printing, the building up or caking of ink on rollers, plate or blanket, so that ink will not transfer readily.  Also, the accumulation of paper dust or coating on the blanket of an offset press.
Pin Register:
The use of accurately positioned holes and special pins on copy film, plates and presses to insure proper register or fit of colors.
Pinfeed Holes:
See Feed Slots.
Pixel (picture element):
The smallest distinct unit of a bit-mapped image displayed on a screen.  A single element, or point, in a picture.  It is the basic unit of digital imaging.
Plate Cylinder:
The cylinder of a press on which the plate is mounted.
Imagesetter for making plates.
See Conformability.
PMS Colors:
The Pantone Matching System. It is an international color language providing an accurate method for the communication, matching and control of color.
(Photomultiplier Tube) A light-sensitive sensor that can sense very low light levels by amplifying the signals applied to it during the sensing.
Printer's unit of measurement, used principally for designating type sizes.  There are 12 points to a pica (approximately 72 points to an inch).
Poor Trapping:
In printing, the condition in wet printing in letterpress and lithography when less ink transfers to previously printed ink than to unprinted paper.  Also called undertapping.
The property of paper that allows the permeation of air, an important factor in ink penetration.
Position Proof:
Color proof for checking position, layout and/or color braekout of image elements.
In photography, film containing an image in which the dark and light values are the same as the original.  The reverse of negative.
A page description language developed by Adobe Systems, Inc. to describe an image for printing.  It handles both text and graphics.  A PostScript file is purely text-based description of a page.
Any software program that translates statements written in the PostScript page-description language.  Sometimes called a PostScript clone.
(Pixels Per Inch) A measure of the amount of scanned information.  The finer the optics of the scanner, the higher the scan resolution.
In digital prepress, the test used to evaluate or analyze every component needed to produce a printing job.
Prepress Proofs:
See off-press proofs.
Presentsitized Plate:
In photomechanics, a metal, film or paper plate that has been precoated with a light-sensitive coating.
Press Proofs:
In color reproduction, a proof of a color subject made on a printing press, in advance of the production run.
Pressure Sensitive Label:
A face material paired with a pressure sensitive adhesive. Every label produced and stocked at CDL is pressure sensitive.
Pressure-sensitive Paper:
Material with an adhesive coating, protected by a backing sheet until used.
Primary Colors:
See additive primaries, subtractive primaries.
Primary Labels:
A high quality label usually specially shaped and designed for labeling retail items. Examples are shampoo labels, pickle jars, etc.
Print Quality:
A term describing the visual impression of a printed piece. In paper, the properties of teh paper that affect its appearance and the quality of reproduction.
Printer Font:
A digital form of a typeface that is installed in a printer or on the computer to outpu type to paper or film.  Also known as output font.
Process Colors:
In printing, the subtractive primaries: yellow, magenta and cyan, plus black in 4-color process printing.
Process Lens:
A highly corrected photographic lens with a flat field for graphic arts line, halftone and color photography.
Process Printing:

The printing from a series of two or more halftone plates to produce intermediate colors and shades.

In computers, sequence of instructions for a computer.  Same as software.
Progressive Proofs (progs):
Proofs made from the seperate plates in color process work, showing the sequence of printing and the result after each additional color has been applied.
A wet-and-dry bulb type of hygrometer.  Considered the most accurate of the instruments practical for industrial plant use for determining relative humidity.
Pull Tab:
See Lift Tab.
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AVERY®, CD STOMPER®, and STOMPER™ labels are manufactured by Avery Dennison. AVERY®, CD STOMPER®, and STOMPER® are registered trademarks of that company. does not manufacture or sell AVERY®, CD STOMPER®, and STOMPER™ brand products.  Avery Dennison product code numbers are trademarks of Avery Dennison.

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