Unlike RGB and CMYK, there is only one LAB color space, and it is device-independent because a specific set of LAB numbers will mean the same thing (i.e. represents the same color) regardless of any device or application that uses it.  In theory, it is meant to be a perceptually uniform color space (there are some anomalies that make it less than perfect). L is the lightness value, a is the red-green opponency, and b is the blue-yellow opponency. L axis (0-100/white - black) represent the Luminosity of an image • when viewing the L channel in Photoshop, you’re seeing the grayscale values of the image a axis (-a to +a / -128 to +127) represents the green (-128) and red (+127) values of an image • when viewing the a channel in Photoshop, the darker shades are GREEN; lighter shades are RED b axis (-b to +b / -128 to +127) represents the blue (-128) and yellow (+127) values of an image • when viewing the b channel in Photoshop, the darker shades are blue; lighter shades are yellow • LAB is meant to represent the color space which contains all the colors that human beings can see • LAB is all encompassing – every color can be plotted and described in LAB • All ICC profiles exist in the LAB color space

Printed sheets were the width is greater than the height. Also used to indicate the orientation of tables or illustrations which are printed ‘sideways’. 

A drawing that gives the general appearance of the finished piece and usually indicates the relationship between illustrations and copy.

The distance between lines of type measured in points.

Letter spacing in typography is the process of increasing or decreasing the space between letters. Typographers may modify the default spacing of a letter in a body of type to aid readability and copy fit, or for aesthetic effect, 

A magnifying glass designed for checking the dot image of a halftone. 

Unit of measurement for resolution of halftone screens, referring to the number of lines per inch in screens produced to create halftones and four-color process images (for example, “printed at 150-line screen”). The more lines per inch, the finer the resolution, and thus the more detailed the printed image will be.

A generic term for any printing process in which the image area and non-image area exist on the same plane (plate) and are separated by chemical repulsion.

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Interconnected computers that can share programs and data files as well as the use of peripheral devices such as printers or CD-ROM drives.

Data compression methods that rearrange or re-code data in a more compact fashion without any loss of information.

Lap appears on the lower numbered pages of a four-page insert. Inserts with low folio laps usually jog to the foot.

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