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Impressions per hour The term most commonly used with offset printing for measuring print
speed. One impression can consist of multiple images on a large sheet
that will be cut into smaller sized sheets after being printed.
Impressions
per minute The term most commonly used with offset printing for measuring print
speed. One impression can consist of multiple images on a large sheet
that will be cut into smaller sized sheets after being printed.
In-line finisher A finishing device, such as a folder or stitcher, that is directly
connected to a digital printer. Paper moves directly from the printer into
the finishing device.
iph Short for impressions per hour.
ipm Short for impressions per minute.
JPEG Short for Joint Photographic Experts Group. An industry body that has
defined a standard for digital compression of image graphic files. The
file size is directly proportional to how much data is discarded.
Just-in-time printing Documents stored digitally and then printed in the exact quantity
required at the precise time required.
Knockout When printing a shape or type in colour, the shape is printed by
eliminating all background colours. This results in a pure colour against
the paper.
L/G Short for long grain.
Lamination A sheet covered with a thin layer of polyester (laminate) to yield a
strong and washable surface.
Lead edge Feed edge of the paper.
Leaf Consists of two pages (front and back of a sheet) in a comb bound or
wire bound book.
LEF Short for long edge feed.
Lightfastness The degree to which a printed page will resist colour changes when
exposed to light.
Lightness The darkness or lightness of a hue. One of the three characteristics that
describe colour (along with hue and saturation). Also called value.
Lines per inch A measure of resolution, especially with halftone screens. The number of
lines, or rows, of halftone dots per linear inch. See screen frequency.
Long edge feed The longest edge of the paper is fed into the printer first.
Long grain Paper in which the orientation of fibres is parallel to the long edge of
the sheet. For example, in an A4 sheet, the fibres of a long grain sheet
are parallel to the 297 mm dimension of the page.
Lookup table A reference file used to convert images from one colour space to
another, such as converting RGB pixels into CMYK pixels for printing.
G – 7
glossary