Xerox manual DocuColor 2000 series design guide, Grain

Grain	Grain direction is the orientation of fibres with respect to the long edge
	of the paper. For example, in an A4 sheet, the fibres of a long grain
	sheet are parallel to the 297 mm dimension of the page (the pages of a
	short grain sheet are parallel to the 210 mm dimension).
Graininess	Weak image (on an offset print) with a granular look caused by ink
	becoming waterlogged and caked.
Grammage	The weight in grams of one square metre of paper (abbreviated to gsm).
Grey balance	The mix of cyan, magenta, yellow and black that produces a neutral grey
	across the tonal range.
Gripper margin	The 10 mm lead edge of the sheet that is rendered unprintable by
	grippers (the row of clips that holds a sheet of paper as it moves
	through an offset press).
gsm	The weight in grams of one square metre of paper. Also called
	grammage.
Gutter	The blank space, or inner margin, from the printing area to the binding.
Halftone	A continuous tone image that has been reproduced with groups of small
	dots.
Halftone screen	To produce continuous tone images on a printing device, the image must
	be broken down into a series of dots of various sizes and colours, called
	a halftone screen.
Halo	The result when a dark coloured object knocks out a coloured
	background that is composed of more than 30 to 70% of one toner
	colour on a xerographic printer.
Hickey	A recurring, unplanned spot appearing on an offset printed image
	caused by dust, lint, dried ink or paper stuck to the blanket.
Highlight	The lightest area in an image or photograph.
Hue	The name of colour, such as green, blue, purple or orange. One of the
	three characteristics that describe colour (along with saturation and
	value).
ICC	Short for International Colour Consortium. An industry body that has
	been set up to create a common framework for colour management.
ICC profile	A file that describes how a particular device (eg, printer, display or
	scanner) reproduces colour (ie, its gamut or colour space).
ICM	Short for Image Colour Matching. The colour management framework
	that is used in the Windows environment. ICC profiles in the Windows
	environment have a .icm extension.
Imposition	The positioning of individual pages on a signature (or press sheet) so
	that after printing, folding and cutting, all pages will appear in the
	proper sequence.

DocuColor 2000 series design guide

G – 6