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parameters are known (gamma, gain, chromaticity
coordinates for each primary, and the white point), the
monitor’s RGB pixel information can be transformed into
device-independent color.
The Color LaserJet printer provides device-independent
color specified using either the CIE L*a*b*, Colorimetric
RGB, or Luminance-Chrominance color spaces.
Color Matching When attempting to match color produced by different
devices, it is important to know the difference between true
color matching and appearance matching.
Proper device calibration can achieve true color matching,
so that a side-by-side comparison of a printed page with the
monitor on which the page was designed will show an exact
match. However, true color matching is only satisfactory
when using the monitor as a viewing reference. Viewed
away from the screen, the printed page may appear flat and
unsaturated because printers and monitors have different
dynamic ranges. For example, black on the screen appears
gray when compared to printed black, which is
unacceptable if the intent is pure black. Likewise, the white
produced on a monitor screen appears yellow or blue when
compared to a white sheet of paper. True color matching
would require that gray be printed in the black areas and
colored dots be printed in the white areas.
Color Appearance Matching
Color appearance matching goes beyond true color
matching by including adjustments for the dynamic ranges
of the devices, so the user’s intent is maintained. For
example, the white areas of a page shown on a monitor
display screen would be printed as white on a printed page
because the user specified white, even though the screen
cannot duplicate a white that truly matches white paper.
Although the printed color does not exactly match screen
color, color appearance does match, which is what users
usually want. To maximize user satisfaction, the PCL
language uses appearance matching when rendering
device-independent color.
1-10 Color Printing Overview1-10 Color Printing Overview