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A-2 Color Printing Overview (Color LaserJet, 5, 5M, DeskJet) EN
When printing color pages, a user can choose one of several color
modes, depending on the desired results. Each color mode has a
palette associated with it. Simple Color Mode provides a palette of
fully saturated colors whose colors are similar to those of a plotter’s
pen colors. The palette is nonprogrammable, and is intended for
simple printing of items such as bar and pie charts. For applications
requiring different or more specific colors, the printer offers the PCL
Imaging and HP-GL/2 Imaging Modes. The palette colors in these two
modes can be modified to provide the desired result.
When choosing color for a particular application, the Color LaserJet
printer provides device-dependent and device-independent color (the
DeskJet 1200C and 1600C support only device-dependent color).
Device-independent color provides accurate color matching based on
an absolute color standard. It is preferred when users want a precise
color to match the output from another device or to match the color on
an existing page.
Besides providing device-independent color for precise color
matching, the HP printers can modify color to compensate for various
characteristics. The Color LaserJet printer supports the following
methods of modifying color (the DeskJet 1200C and 1600C printers
support halftone algorithms and gamma correction, but not color
lookup tables or the Viewing Illuminant command).
• Halftone render algorithms determine how colors are rendered
using the printers available colors. Halftone algorithms can be
used to change apparent resolution, change the texture of
images, reduce the number of colors, and change a color
image to monochrome.
• Color lookup tables can remap colors to compensate for
various differences in input data, such as unwanted color casts
caused by unbalanced photographic light sources.
• Gamma correction provides a way to adjust for color
differences in display monitors so that the display more closely
matches the printed output.
• Since the appearance of colors changes under different
viewing light sources, the Viewing Illuminant command allows
the application to modify output color based on the light source
used to view the printed page.