- Packing:
Paper used to underlay the image or impression cylinder in letterpress or the plate or blanket in lithography to get the proper squeeze and pressure for printing.
- Pagination:
The automated process of numbering pages consecutively.
- Paint Program:
Graphics program that treats images as a collection of individual dots or picture elements (pixels) rather than as a collection of shapes (or objects).
- Palette:
The collection of colors or shades available to a graphics system or program.
- PDF:
Portable Document file. A proprietary format developed by Adobe Systems for the transfer of files across computer platforms.
- Perceptual Rendering Intent:
A rendering intent that determines how a file’s color values will be remapped from the current color space into the target color space; in this case all colors are compressed so that out-of-gamut colors are brought into the target color space in such a way that maintains a distinction between the colors, and thus preserve the overall color appearance of the image.
- Perfect Binding:
A binding method where the binding edge of a book or magazine is ground down about 1/8 in. and coated with a flexible adhesive. Then a flexible cover is attached creating a squared-off backbone.
- Perfecting Press:
A press that prints on both sides of the paper during a single pass.
- Perforations (Perfs):
A series of small dots or dashes made in paper that allows and controls the tearing of paper. Perfs are indicated on the marksheet by dashed lines.
- Pica:
A typographic measurement. There are 12 points to a pica and approximately 6 picas to an inch.
- Picking:
Removing emulsion on a negative so that light can pass through, creating an image.
- PICT:
A standard data format in which most Macintosh illustrations are encoded. PICT data can be created, displayed on the screen, and printed by routines incorporated in the Macintosh system.
- Pinholes:
Tiny areas that are not covered by ink.
- Pixel Depth:
The amount of data used to describe the color of each pixel in a digital photo or image. Monochrome is 1 bit deep; greyscale is 8 bits deep; RGB is 24 bits deep; images printed as CMYK are 32 bits deep.
- Pixel:
Abbreviation for picture element, the smallest unit that can be sensed, manipulated, or output by a digital system or displayed on a computer screen.
- Pixels Per Inch (PPI):
A measurement referring to the number of pixels in every linear inch of a digital image.
- Plate Information:
A section of the job ticket that indicates the correct number and color plates needed for each job.
- Plate Instructions:
A series of instructions pertaining to be used when exposing images on the plates to be used on press.
- Plate:
Reproduction of type and images on metal, plastic, rubber or other material to form a printing surface.
- PMS (Pantone Matching System):
A proprietary color system for choosing and matching specific spot colors. Almost all printers worldwide use this system for color matching. The Pantone Matching System provides designers with swatches for specific colors and gives printers the recipes for making those colors.
- Point:
Unit of measurement commonly used for specific type sizes. There are 12 points in a pica and 72 points in an inch.
- Porosity:
The open or closed characteristics of a paper's surface that allows air to pass through and ink to penetrate. Generally, coated papers have very closed surfaces, low porosity and hold ink on the surface well. Some papers used for blow-in cards are porosity rated for bindery use.
- Portrait:
An upright image or page where the height is greater than the width.
- Position Proof:
A color proof that is made to verify that all the elements of the reproduction (text, graphics, and pictures) are in the correct position and are in register with each other.
- Postscript Fonts:
A scalable font technology from Adobe that renders fonts for both the printer and the screen. PostScript fonts come in Type 1 and Type 3 formats. Type 1 fonts use a simple, efficient command language and are widely used. Type 3 fonts can use the entire PostScript language to create complex designs, and Type 3 fonts can also be bitmaps.
- PostScript:
A page description language consisting of a specific set of software commands and protocols that are used when an electronic document is translated through a raster image processor. The key feature of PostScript is device independence, allowing different output devices from different manufacturers to print the same file in the same way in terms of its appearance and/or shape despite any differences in output capabilities between the two devices in question.
- Pre-Flight:
A pre-press sub-division whose responsibility is to check files prior to production. This is done to assure that all material is correct and matches prep instruction sheets and pre-press information on the job ticket.
- Premastering:
Creating a recorded file that contains the exact “image” or file layout of a CD-ROM, with error correction and timing information, ready for mastering.
- Press Run:
1) The actual running of the press to print the job following make-ready 2) The number of printed pieces in an order.
- Press Schedule:
An orderly list of jobs scheduled to run on each press which is updated at the beginning of each shift by Schmidt's scheduling department.
- Printer Font:
A file sent to the printer which instructs the PostScript interpreter how "to draw" the characters of the font. Printer fonts generally have matching screen fonts.
- Printing:
Any process that transfers to paper or another substrate an image from an original such as film, electronic memory, die or plate.
- Process Colors:
The subtractive primaries: cyan, magenta and yellow that are used along with black in four-color process printing.
- Profile Connection Space (PCS):
The color space used as the intermediary for conversions from one color space (as defined by its profile) to another. In the ICC specification, the PCS is either CIE XYZ or LAB.
- Profiling:
The act of creating a profile by measuring the current state of the device, describing the color and tonal capabilities and behavior of a device. Sometimes known as characterization. Usually done after calibration of a device.
- Proofing/Plating:
The pre-press sub-division that creates single and flat proofs, plates, and other materials from negatives.
- Proportion Wheel/Scale:
Used to calculate the percentage that an original must be reduced or enlarged to yield a specific reproduction size.