P
pelbox
Interface that is often used in newspaper imagesetters and platesetters to connect them to a RIP. Pelbox was developped by ECRM but it is used in other manufacturers equipment as well. It is a unidirectional system, meaning that data are send from the RIP to the engine but the engine cannot use Pelbox to return error messages or logging data to the front end system.
percent sign
%
perfect binding
Method of binding of which pages are held together and fixed to the cover by means of a flexible adhesive. Widely used for paper back books.
perfecting press
A printing press that prints both sides of a sheet or web in one operation.
perforation
Lines of tiny holes cut into a sheet, either on or off press, so that the sheet may be easily torn at the perforation line.
peripheral
Any device that is an add-on component to a computer system. Each is physically separate from the main unit and connected to it by a wire or cable. In the case of the PC, a peripheral is hardware, such as a disk drive, scanner, printer or modem, that is used with the conjunction with the computer and controlled by it.
PFB
Abbreviation for Printer Font Binary.
PFM
Abbreviation for Printer Font Metrics.
photo CD
CD that contains images that have been saved in the proprietary photo CD image format developed by Kodak. Photo CD images are stored in a multitude of resolutions and can be used for professional prepress, even though they often contain a color cast and lack sharpness.
Photo YCC
A color space definition used in the Eastman Kodak Photo CD System. It is based on the use of one luminance and two chroma record channels.
photodiode
A light sensitive photocell on a computer chip that can measure the amount of light falling on the surface.
photodiode array
In a scanner, a series of photodiode arranged in a line to sense numerous pixels, either simultaneously or sequentially, during input scanning.
physical dot area
The actual coverage of halftone dots in a given area, expressed as a percentage.
physical dot gain
The increase in actual dot size from the halftone dot on the film or the dot in a computer file to the same dot printed.
pica or pica point
Unit of measurement, mainly used by designers. Check this page for more information.
picon
Abbreviation for Picture ICON, usually a single frame of video, representing a sequence of video or animation.
PICT
Native file format of the Apple QuickDraw system software. Click here for more information.
pinholes
Small, light passing holes in the emulsion of a photographic negative. Must be opaqued out before platemaking.
pitch
- Rotation about the y axis.
- An expression of a halftone screen frequency.
- Material used to hold glass blanks during manufacturing of lenses.
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