P
positive
- A film that has the same light and dark tonal relationships as compared to those of the original copy.
- The film image of a complete page that is used to make a positive working offset plate, which will produce a positive printed image.
positive working plate
A lithographic printing plate that is exposed through a film positive and used in printing a positive image.
positive working
The process of printing using positive separation films, flats of assembled film positives and positive printing plates, rather than negative separations and printing plates as used in negative working printing. Alternatively called reversal process.
POSIX
Abbreviation for Portable Operating System Interface.
POST
Abbreviation for Power-On Self Test, the series of tests (including memory tests) that a computer goes through before it starts loading the operating system.
posterize
A special visual effect created by setting a defined number of gradient steps in bitmap graphic.
PostScript
A page description language, developed by Adobe Systems, consisting of a specific set of software commands and protocols that form images on output printers and film recorders when translated through an RIP. The key feature of PostScript is device independence which allows many different outputs devices from different manufacturers to print the same file in more or less the same way.
PostScript clone
A RIP, in hardware or software, which interprets PostScript files, designed and/or manufactured by PostScript company without authorization or engineering assistance from Adobe Systems. Images generated by PostScript clone RIP’s ordinarily appear identical to those that would be created by true PostScript RIP.
power stabilizer
A transformer used to insure that the electrical power feeding a computer or system has a constant voltage.
PPD
Abbreviation for PostScript Printer Description file, a file specification set by Adobe Systems, containing information about specific performance characteristics of an output device.
PPML
abbreviation for Personalized Print Markup Language, an industry-standard print language to make it much faster to print documents that have reusable content. The language uses XML as its syntactical base. PPML has been developed by PODi.
PPP
abbreviation for Point-to-Point Protocol, a protocol that allows computers to access the internet using a modem.
precision
Average deviation from the required position; accuracy with which a device can position an object.
preflight
The practice of inspecting incoming or outgoing jobs (ads, pages or complete flats) before trying to process or send them.
prepress
A collective term for the steps taken to prepare original artwork for printing.
press gain
Dot gain caused by the spreading of ink on the press, especially in the midtones. Printers must compensate for this tendency, which can vary with ink type and paper type.
press proof
An image printed before the production pressrun to verify that the desired effect can be achieved, using the production inks and production substrate. The pressrun may or may not be the one used for the production pressrun.
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