| G |
Galley
Proof: |
A
proof of text copy before being made into pages.
|
Gamma:
|
A measure of
contrast in photographic images.
|
Gathering:
|
In binding, the
assembling of folded signatures in proper sequence.
|
GCR:
|
(Gray Component
Replacement) The removal of equal amounts of cyan, magenta, and yellow
in gray areas of a 4-color halftone, and replacement of these colors
with a higher proportion of black. This produces a clearer,
less muddy effect.
|
Gear
Streaks: |
In printing,
parallel streaks appearing across the printed sheet at the same interval
as gear teeth on the cylinder.
|
Generation:
|
Each succeeding
stage in reproduction from the original copy.
|
Ghosting:
|
Indistinct image
patterns appearing as solids or reverse printing, typically caused
by poor ink distribution, inconsistency in plate and/or substrate
thickness. This is also referred to as shadows.
|
Gigabyte:
|
(GB) One billion
bytes.
|
Gloss:
|
The property
of a face material to have a mirror like finish or high shine.
|
Goldenrod
Paper: |
In offset lithography,
a specially coated masking paper of yellow or orange color used by
strippers to assemble and position negatives for exposure on plates.
|
Gradation:
|
A smooth transition
between two different colors or densities.
|
Grain:
|
In papermaking,
the direction in which most fibers lay that corresponds with the direction
the paper is made on a paper machine.
|
Grammage:
|
A term in metric
system for expressing the basis weight of paper. It is the weight
in grams of a square meter of the paper expresses in g/m2.
|
Gravure:
|
An intaglio printing
process in which the image area is etched below the surface of the
printing plate and is transferred directly to the paper by means of
pressure.
|
Gray
Balance: |
The dot values
or densities of cyan, magenta, and yellow that produce neutral gray.
|
Gray
Level: |
The number of
gray values that can be distinguished by a color separation filter
- usually 256.
|
Gray
Scale: |
A strip of standard
gray tones, ranging from white to black, placed at the side of original
copy during photography to measure tonal range and contrast (gamma)
obtained.
|
Gray
Scale Image: |
An image whose
gray values run throughout the gray scale. The range of the
gray values is determined by the number of bits that define the image.
|
Greeking:
|
To indicate type
by substituting rules, gray lines or nonsensical characters for actual
letters.
|
Gripper
Edge: |
The leading edge
of paper as it passes through a printing press. Also, the front
edge of a lithograpic or wraparound plate that is secured to the front
clamp of a plate cylinder.
|
Gripper
Margin: |
Unprintable blank
edge of paper on which grippers bear, usually 1/2" or less.
|
Grippers:
|
In sheetfed printing
presses, metal fingers that clamp on paper and control its flow as
it passes through.
|
Groundwood
Pulp: |
A mechanically
prepared wood pulp used in the manufacture of newsprint and publication
papers.
|
GUI:
|
(Graphical User
Interface) Pronounced "gooey". In digital imaging,
a technical term for a system that lets users manipulate files by
pointing to pictures (icons) with a mouse or other pointing device
instead of having to type in key commands.
|
Gum
Arabic: |
In offset lithography,
used in platemaking and on press to desensitize the nonprinting
areas of plates.
|
Gumming:
|
In platemaking,
the process of applying a thin coating of gum to the nonprinting areas
of a lithographic plate.
|
Gutter:
|
The blank space
or inner margin from printing area to binding.
|
