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254 Spire CX250 Color Server User Guide
Imposition
The arranging of pages in a press form to ensure the correct order
after the printed sheet is folded, bound and trimmed.
Ink jet proof
A proof of a digital image printed by using jets that squirt minuscule
drops of ink. Ink jet proofers can print onto a variety of surfaces.
Job Flow
Job flow refers to the job parameter settings of selected virtual
printers that are automatically applied to all jobs printed using that
virtual printer. These settings determine how a sent or imported file
is processed. For example, a file sent to a virtual printer with a Process
& Print job flow will be RIPped, printed and stored in the Storage
Folder. A file sent to a Process & Store job flow virtual printer will be
RIPped and stored, without printing.
LEF
A printer page orientation, where pages are delivered long edge first.
Laserwriter driver
A part of the Macintosh system software which generates PostScript
instructions from an application file when the Print command is
activated.
Look-up table (LUT)
A two or three-dimensional array of values stored for specified input-
output relationships. When one input value is known, the system can
automatically determine the correct output value. For example, the
system can find the needed dot size for a given set of printing
conditions based on the stored gray level; color setups can be saved in
color tables (color transformation tables) which are one of the many
kinds of LUTs.
Linework
Linework graphics are characterized by sharply defined lines and very
clear transitions from one color to another. Linework is stored in the
computer as a series of geometric (vector) drawing instructions.
Metamerism
Metamerism occurs when two colors match under one light source,
but appear different under another light source. Those two colors are
called a metameric match. A metameric match might cause problems
when trying to match proofs to press-sheets under different lighting
conditions.
Midtones
Density values of an image (original or reproduction) between the
highlights and the shadows. In the reproduction, midtones are
printed with dot areas between approximately 40% or 60%. See also
Highlights and Shadows.