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EN Color Vector Graphics (HP-GL/2) 7-19
CR (Color Range)
The CR command sets the range for specifying relative color data.
Note This command is only supported by the HP Color LaserJet, Color
LaserJet 5, 5M, and DeskJet printers. It is not supported by the
HP Color LaserJet 4500 or 8500 printers.
CR [b_ref_red, w_ref_red, b_ref_grn, w_ref_grn, b_ref_blue,
w_ref_blue;]
Relative color is in reference to a range defined by a black and white
reference value for each primary (red, green, and blue). For example,
if the white reference is set as red=63, green=63, blue=63, and the
black references are set as red = 0, green = 0, and blue = 0, then
white = 63, 63, 63; black = 0, 0, 0; and medium blue = 0, 0, 31.
However, if the white reference is set as red = 63, green = 127, blue =
31 and the black reference is set as red = 4, green = 0, and blue = 0,
then white = 63, 127, 31; black = 4, 0, 0; and medium blue = 4, 0, 15.
The first two parameters set the black and white references
(respectively) for red; the second pair sets the green references, and
the final pair the blue reference values. If the black reference value for
any primary is equal to the white reference value for the same
primary, the command is ignored.
The default for red, green, and blue “black references” is 0; the default
for red, green and blue “white references” is 255.
This command is defaulted by the “CR;” and IN commands.
Execution of this command causes current pen colors to be
remapped to the new range, so that current palette colors remain
unchanged.
Parameter Format Functional
Range
Parameter
Default
b_ref (red,
green, blue)
clamped real -32768 to 32768 0
w_ref (red,
green, blue)
clamped real -32768 to 32768 255