HP PCL/PJL reference (PCL 5 Color) - Technical Reference Manual

EN Modifying Output Color (Color LaserJet, 5, 5M, DeskJet) D-23
No Adjustment
This setting provides linearization only (that is, the user sees the
device as a linear device).
Process Blue
This setting provides the same results as Vivid Graphics (linearization
plus user-preferred enhancements) with the addition of mapping
process blue, which looks slightly purple, to a blue closer to that of a
standard monitor. This setting is not supported by HP Color
LaserJet 5 and 5M printers.
Vivid Graphics
This setting adds color saturation to the resulting image.
Transparency
This setting uses a map to render the best color output on
transmissive media. This setting is not supported by HP Color
LaserJet 5 and 5M printers.
Out of Gamut
This setting prints colors in an image that are out of gamut—all colors
that are in gamut snap to white, all out-of-gamut colors are snapped
to the gamut surface. This setting only supports the
device-independent color map. This setting is not supported by
HP Color LaserJet 5 and 5M printers.
CIE L*a*b* Match
This map performs a true color match to the requested CIE L*a*b*
input (there are no appearance matching adjustments). This setting
only supports the device- independent color map. This setting is not
supported by HP Color LaserJet 5 and 5M printers.
Screen Match
This setting produces a simulated Colorimetric RGB effect of device
independent color to match the color to a Sony Trinitron monitor while
operating out of a device dependent color space. This setting is
supported only by HP Color LaserJet 5 and 5M printers.