Glossary
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- 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
- Acronym for Gray Component Replacement.
- Gear Streaks
- In printing, parallel streaks appearing across the printed sheet at same interval as gear teeth on the cylinder.
- Generation
- Each succeeding stage in reproduction from the original copy.
- Ghosting
- A faint image from another area of the sheet that reappears in the solid.
- Gigabyte (GB)
- One billion bytes.
- Global Warming
- The rise of air temperature at the Earth's surface caused by the build-up of gasses in the Earth's atmosphere which trap radiant heat from the sun. The principle culprits are CO2, CFC's and Methane.
- Grain
- In papermaking, the direction in which most fibres lie which corresponds with the direction the paper is made on a paper machine.
- Grammage
- (GSM) Grams per square metre. The term used to denote the weight of paper or board. Literally the weight of a piece.
- Gray scale
- A strip of standard grey tones, ranging from white to black, placed at the side of original copy during photography to measure tonal range and contrast (gamma) obtained.
- Grip into the job
- A printer's term where the job allows the use of an unprinted area for gripping while printing, thus eliminating the need to provide a gripper margin on the job.
- Gripper edge
- The leading edge of paper as it passes through a printing press. Also, the front edge of a lithographic or wraparound plate that is secured to front clamp of plate cylinder.
- Gripper margin
- Unprintable blank edge of paper on which grippers bear, usually ½" or less.
- Grippers
- In sheet fed printing presses, metal fingers that clamp on paper and control its flow as it passes through.
- Ground wood pulp
- A mechanically prepared wood pulp used in the manufacture of newsprint and publication papers.
- Gumming
- In plate making, the process of applying a thin coating of gum to the non-printing areas of a lithographic plate.
- Gutter
- In printing the blank space or inner margin from printing area to binding. In paper making a description of a paper fault where a u shaped deormation occurs in the sheet or reel running in the machine direction. Also known as piping or rope marks.