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Device-Independent
Color Spaces
The following PCL commands can alter color processing for
device-independent color spaces:
Rendering Algorithm (?*t#J)
Gamma Correction (?*t#I)
Color Lookup Tables (?*l#W)
Configure Image Data (?*v#W)
Viewing Illuminant (?*i#W)
Monochrome Print Mode (?&b#M)
Device-independent color spaces are supported under the
following conditions:
1. The Configure Image Data command (?*v#W) configures
the current palette and specifies a device-independent
color space.
2. The Render Algorithm command (?*t#J) is set to one of
the following:
Nearest Intensity (?*t0J)
Device Best (?*t3J, ?*t5J)
Error Diffusion (?*t4J, ?*t6J)
Cluster Ordered Dither (?*t7J, ?*t8J)
Ordered Dither (?*t11J, ?*t12J)
Color processing reverts to device-dependent processing if
the render algorithm is changed from one of the above. This
is because extensive device characterization is necessary to
achieve device-independence—calibration must be based on
known parameters that affect the device’s color gamut.
Render algorithms such as Snap to Primaries (?*t1J),
Snap Black to White and Colors to Black (?*t2J), or
User-Defined Halftone (?*t9J) either limit the number of
colors available, or are undefined to the extent that their
performance is not as precise. These algorithms, therefore,
produce device-dependent results. Device-independent color
is again generated if the render algorithm changes to one of
the 5 listed above and the color space has not changed.
1-8 Color Printing Overview1-8 Color Printing Overview