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Gatefold

When both sides of an oversize page fold into the gutter in overlapping layers.

Gloss Paper
Gloss can refer to the reflectivity of paper itself or of the printed result on it. Gloss of paper is measured by using a Gardner gloss meter, which measures reflected light at an angle of 75 degrees, and is expressed in Gardner gloss units - the higher the number the glossier the paper surface.Paper with a gloss finish, usually used for higher quality printing

Ghosting

A faint image on a printed sheet appearing in an area where it was not intended. Mechanical ghosting develops a repeat image on the same side of the sheet due to a press condition, such as blanket problems and ink starvation. Chemical ghosting develops as an image on the back side of a sheet, transferred from the front of the sheet below and occurs during the drying of the ink on paper.

Gradient
A gradual changing of screen densities which creates a blending from light to dark, or dark to light.

Grain
In a negative, print, or transparency, the visual appearance or texture created by the silver particles on the film. Frequently considered undesirable and apparent when an original is enlarged too much. 2. In paper, the direction in which the fibres line up during the manufacturing process. It is easier to fold, bend, or tear the paper along the same direction of the fibres. Cut sheet laser printers generally use long grain paper in which the grain runs parallel to the long side of the paper, resulting in better performance through the laser printer.

Grippers
Metal finger like clamps that grab the paper to pull it through the press as the sheet is being printed.

Grain direction
During manufacture the fibres in a web of paper naturally take up an alignment roughly parallel to the direction of travel of the web on the papermaking machine and this becomes the grain direction.

Once guillotined down to sheet form, papers are called 'long grain' if the fibres are parallel to the long edge of the sheet, or short grain if parallel to the short edge.
Grain direction can affect stiffness, folding, creasing and printing characteristics.

Grammage/GSM
These all mean 'grams per square metre' and are a measure of the weight of a paper. For example if an 80gsm paper was in a sheet size of 1000mm x 1000mm i.e. a square metre one sheet would weigh 80 grams.

Gravure
The process of printing from an etched copper cylinder or wraparound plate that contain cells that hold the ink for transfer to the substrate. In gravure colour printing, each succeeding colour is printed on a dry colour, rather than one still wet as in offset lithography.

Ground wood pulp
A wood pulp that contains the natural wood impurities and has not been chemically processed. Also known as mechanical pulp.