A Packet refers to the unit of data between an origin and a destination on the Internet. When any file ( e-mail message, HTML file, GIF file, URL request, and so forth) is sent from one place to another on the Internet, the Transport Control Protocol (TCP) layer of TCP/IP divides the file into sections that are an efficient size for routing. Each of these packets include the Internet address of the destination. The individual packets for a given file may travel different routes through the Internet; when they have all arrived, they are reassembled into the original file (by the TCP layer at the receiving end).

The Pantone colour formula guide provides an accurate method for the selection, specification, communication, reproduction, matching and control of solid Pantone Matching System colours, the international printing, publishing and packaging colour language.
Where special colours are required (i.e. not a four colour process), the Pantone system is used throughout the world as a convenient way of specifying a colour.
Pantone books contain tear-off swatches which can be attached to the artwork. However, the reference number alone is usually sufficient. Two colour jobs are usually black with a Pantone second colour.
The system is supported by a global Pantone colour communication network, comprised of companies licensed by Pantone to produce and distribute Pantone colour products and services. Printing inks in Pantone colours are available worldwide from Pantone licensed printing ink manufacturers.

International system of designating colours for printing reference given as a code number. For example PMS375C which is the reference code for a Lime Green colour specified for printing on to a coated paper.

PDF stands for Portable Document Format. PDF is a highly flexible format for creating documents that can be distributed to a cross platform audience for viewing, collaboration or interactive projects. You can create a PDF file on a Macintosh and send this to a PC user who will be able to view the document just as it was intended.
For previews of data, a very small file can be generated that is easy to distribute. In a pre-press environment larger files are created with more detail embedded. PDF files can also contain multimedia elements like movies or sound as well as hypertext elements like bookmarks, links to e-mail addresses or web pages and thumbnail views of pages.
To create a PDF commercial software is required, but to view the file a free reader application can be obtained from Adobe. Mac OS X allows PDF’s to be created from virtually any software and even previewed within the Finder view.
Adobe developed the PDF system and market a variety of tools to create and view PDF’s, but because the specifications of the file format are publicly available, many other vendors have also produced PDF tools and utilities.

Pages of a book which are glued together to give a square spine.

A printing press which prints on both sides of a sheet of paper in one operation.

Running a dotted score into paper to allow the paper to be pulled apart.

Where data elements are unique to an individual print piece. Concept facilitated by digital printing.

PICT is a simple file format developed by Apple Computer in the 1980’s as the native format for Macintosh screen graphics. PICT files are encoded with QuickDraw commands so can also be used to exchange data between applications. In pre-press and publishing the format is virtually ignored in favour of TIFF and EPS files.
In the current version of its operating system, Mac OS X, Apple has decided to replace PICT with PDF.

Ping is an Internet program that lets you verify that a particular Internet address exists and can except requests.

Plug-and-play refers to when you can plug a device into a computer and have the computer recognise that it is there.

In the context of the Web, these are 'extensions' to your browser which enhance its functionality. Plug-ins enable you to play sound files or animation's, for example. POPs Points of Presence. Refers to the modems which you dial into to connect to the Internet.

Post Office Protocol 3. POP3 is a client-server protocol in which e-mail is received and held for you by your Internet server. Periodically, you check you mailbox on the server and download any new mail.

Point to Point Protocol. This refers to the protocol that lets your computer connect to the Internet via a modem.

Pixels per inch which indicate the resolution of images. The more dots per inch, the higher the resolution and the better quality the image.

A general term for software which tests files to make sure that fonts, image, colours and page size are correct.

A metal plate which has the inked images involved in the offset plate lithography printing process. It is important to realise that each colour in a printing job requires a separate plate. In order to keep costs down, it is advisable not to have too many special colours.

A Blanket or Printer's Blanket in offset litho printing, a rubber surfaced fabric that is clamped around a cylinder on a litho press, to which the image is transferred from the plate and from which it is transferred to the paper.

The colours which make up full colour printing. Cyan, magenta, yellow and black.

A printed sample of work to be checked for errors in text, positioning or quality of colour reproduction. Please click here for details about the different types.

This is the native file format for Adobe PhotoShop. PSD allows you to save a file while preserving multiple, editable layers that can be re-opened and modified at a later stage.
Traditionally a PSD file would need to be exported or ‘flattened’ to an EPS or TIFF file for placing into a layout application. When saved as another format the individual layers can no longer be edited but general characteristics such as colour space and size can be changed. This is not necessary when using certain OPI systems or Adobe InDesign, which allow PSD files to be placed directly into pages.
As the format preserves all information about the raster data and layers, PSD files are usually much larger than an exported version.


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