Galley
Typeset material before it has been arranged into page form.
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Galley Proof
Proof of typeset material in galley form prior to page makeup.
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Gang Scanning
Sequential scanning of multiple originals using the same previously defined exposure setting for each.
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Gatefold
A four page insert, having foldouts on either side of the center spread.
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GATF (Graphic Arts Technical Foundation)
A scientific, technical and educational organization serving the graphics industries, to conduct research in all graphic processes and applications.
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GATF Star Target
A quality control aid which is a target smaller than a dime, with pie-shaped wedges of lines that converge to the center. It is commonly printed with color bars, on the edge of a press sheet. It is used to detect dot gain, slurs, double images or spreading of the image.
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Generation
Each succeeding stage in reproduction from the original.
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Ghost Halftone
See: Fadeout Halftone.
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Ghosting
The undesirable appearance of faint replicas of printed images, caused chemically or mechanically.
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GIF
Graphic Interchange Format. A standard file format (developed by CompuServe) for displaying images on the world wide web. These files are low resolution RGB or Indexed color files and should not be used for print publishing.
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Gigabyte
An electronic unit of measure equal to about 1,000 megabytes of data (or 1,000,000 bytes). Gigabytes are abbreviated as gb.
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Glazed
Paper with a high gloss or polished finish.
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Glide-Pak
A customer furnished corrugated cardboard, on which cartons are piled and banded for shipment.
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Gloss
A paper's shine or luster, which reflects light.
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Gloss Ghosting
See: Chemical Ghosting.
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Gloss Ink
An ink containing an extra quantity of varnish, which gives a glossy appearance when dry.
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Glossy Print
A photographic print on a shiny-finished paper. Prints intended for reproduction are usually made on such paper.
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Glued-On Cover
A paper cover fastened to the text with glue.
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Gluing Off
The process of applying glue to the spine of a book to be casebound, after sewing and smashing, before trimming.
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Goldenplast
Stable base sheeting which can be used for assembling and positioning negatives or positives for exposure in platemaking; used in place of Goldenrod; also called Orange Plast.
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Goldenrod Flat
Negatives (or positives) assembled for exposure in contact with a light-sensitized press plate. The goldenrod paper used is translucent enough to see the penciled layout on the underside, or master layout on a separate white paper beneath, so film negatives can be attached in proper position with tape. The goldenrod paper is cut away to place the emulsion side of negatives to the emulsion on a metal plate; also called Form. The flat is also used for making Bluelines.
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Goldenrod Paper
A specially coated masking paper of yellow or orange color, used to assemble and position negatives for exposure to press plates; also called Masking Paper.
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Gradation
Variation in tonal values, from white to black.
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Grade
A means of ranking various kinds of paper and cloth.
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Gradiaiton
A gradual change of color percentages over a specified distance.
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Gradient Fill
The gradual transition between one color to another, or the smooth blending of colors of white to black.
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Graduations
Variations in the ink values between white and a single color. The different tint values pass smoothly from one value into another value.
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Grain
In paper, the machine direction in paper-making along which the majority of fibers are aligned. This governs some paper properties such as increased size change with relative humidity across the grain, and better folding qualities along the grain.
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Grain Long
Paper in which the grain runs parallel to the longest measurement of the paper.
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Grain Short
Paper in which the grain runs parallel to the shortest measurement of the paper.
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Grainy Printing
Printing characterized by unevenness, particularly of halftones.
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Granite Finish
Paper that has been mottled by the addition of fibers of a different color, to resemble the texture of granite.
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Graphic
Any non-text element, such as art work, a photo, drawing, chart, graph, border, etc.
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Graphic Arts
In common usage, all components of the printing industry.
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Gray Balance
The specific values of Cyan Magenta and Yellow that produce a neutral gray when printed at target densities
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Gray Goods
Undyed, unfinished book cloth as it comes from the loom.
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Gray Scale
A strip of standard gray tones ranging from white to black, to measure the tonal range obtained during photography or plate exposure. See also: Sensitivity Guide.
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Gray Scale Image
An image that is made up of various levels of gray and is not restricted to just black and white. The number of bits defining the image determines the number of levels of gray available.
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Grayscale
The palette that ranges from black to white, with various shades of gray.
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Grid Pattern
The shape of halftone screen dots. Some common shapes are linear, elliptical, and round. Different shapes cause different effects in the final output. Adobe Photoshop allows you to specify a diamond dot, which is supported on some of the newer imagesetters. Contact your vendor to find out whether your imagesetter supports the diamond dot function.
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Gripper Edge
The leading edge of a sheet of paper passing through a printing press. It is the longer edge of the sheet.
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Gripper Margin
The unprintable back edge of paper, which press grippers clamp on; usually 1/2
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Grippers
Metal fingers on a sheet-fed press that clamp on paper and control its flow as it passes through the press.
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Gross Weight
The total weight of merchandise and shipping container.
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Groundwood Paper
Paper made from groundwood pulp; paper used for newspapers and other forms of non-permanent printed materials.
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Groundwood Sheet
Cheap paper containing a proportion of bark, in addition to wood fibers. This makes it acidic and leads to early decay.
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Guarded Signatures
See: Reinforced End-sheets.
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Guide Edge
The edge of a printed sheet at right angles to the gripper edge, which travels along a guide on the press or folder. This edge, like the gripper edge, should never be altered or manipulated between the printing and folding operations. It is the shorter edge of the sheet.
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Guide Marks
A method of using crossline marks on the offset press plate to indicate trim, centering of the sheet, centering of the plate, etc.; sometimes called Register Marks.
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Guide Side
The side the press uses to guide the sheet to the exact side position, usually the side toward the operator; also known as Operator or Control Side.
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Gummed Labels
Labels with an adhesive on the back which must be moistened for application.
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Gumming
The treating of plate surfaces with a thin coating of Gum Arabic as a protection against oxidation and as an aid to desensitizing the plate.
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Gutter
(1) In multi-column composition, the blank space between columns on a page.
(2) Short for Gutter Margin.
(3) The inner edges of a book page; the edges closest to the bind.
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Gutter Margin
In binding, the blank space where two pages meet; the inside margin at the binding edge; also called Back Margin or Bind Margin.
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