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EN Modifying Output Color (Color LaserJet, 5, 5M, DeskJet) D-1
D
Modifying Output Color
(Color LaserJet, 5, 5M,
DeskJet)
Introduction
The previous appendices of this manual have been concerned with
giving an overview of the color printing process, choosing color
modes, and using palettes. This portion of the manual explains how
color can be modified to produce a desired result, from using halftone
render algorithms to change the way color is rendered, to
compensating for the yellow cast caused by a tungsten light source in
a photograph. The HP color printers can modify colors using the
following means:
• Halftone render algorithms provide a way to modify images
based on a dither cell concept. The algorithm chosen
determines how specified colors are “rendered” as dots on the
printed page.
• Color lookup tables can remap palette colors to compensate
for unwanted color characteristics of input data. For example, if
a scanned photograph had a reddish cast, a color lookup table
could be used to make the printed image look as if it were
taken under a more balanced light source.
• Gamma correction provides a way to adjust for color
differences in display monitors.
• The Viewing Illuminant command allows you to vary the xy
chromaticity coordinates for the light source under which you
will be viewing a printed piece. For example, if the printed
document is to be viewed under a tungsten light, the command
modifies colors so that they have the correct appearance when
illuminated by a tungsten light bulb.
• The Monochrome Print Mode command converts each color to
its grayscale equivalent for faster draft printing.