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G-7 Glossary
subtractive primaries
Cyan, magenta, and yellow colorants
used in subtractive color systems for
color printing. Combining the
subtractive primaries produces darker
colors. Black is added to the
subtractive primaries to compensate
for deficiencies of the toners or inks,
and for more efficient black printing.
substrate
In printing, the material upon which
the job is printed.
SWOP
The abbreviation for Specifications for
Web Offset Publications. A standard
of specifications for separations,
proofs, and color printing on a web
offset press (not a sheet fed press).
undercolor removal
In areas where all three process colors
(C, M, Y) overprint, the amounts of
those colors are reduced and replaced
by black. This improves wet ink
trapping and reduces ink costs in
process color printing.
vector image
Graphic illustration created on
computers where picture objects are
defined mathematically as lines or
curves between points. These
mathematical definitions are
interpreted by an image language such
as PostScript. Vector images include
artwork created with illustration
applications (such as Illustrator or
FreeHand) and page layout
applications (such as PageMaker).
white point
The color temperature of any white
light source, typically expressed in
degrees Kelvin (for example, 6500 K,
typical for the white of a monitor).
workflow
The path a print job follows from
creation to destination. A workflow
may originate with an RGB scan
imported to the client workstation
and opened on the desktop in an
image processing application, such as
Photoshop. After adjustments are
made to the scanned image, it is
evaluated on a color proofing device
for eventual color printing on the
same device or on press.