Digital Image - A picture that is in computer language. Because the picture is represented by a series of numbers, it is very easy and improve the image or to alter it.

Point - A unit of measurement used in the graphic arts industry. There are 12 points to a Pica. One point equals approximately 1/72 inch. See "Postscript Point."

Color Key - A printer's proofing system developed by 3M that makes separate acetate sheets of CMYK that when stacked give a representation of the offset printing of a color image.

PPI (Pixels Per Inch) - Often used interchangeably with DPI, PPI refers to the number of pixels per inch in an image.

Dot - Dots make up an image in color separations or halftones. Halftone dots will have a fixed density but have variable size (amplitude modulation).

PAL (Phase Alternation Line) - A standard for video that is common in Western Europe, Australia and other countries.

Portrait, Portrait Mode - The orientation of an image that is taller than it is wide; a setting controlling an output device to properly fit a computer document to the print medium.

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