HP PCL 5 User Manual Page 257

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EN Modifying Output Color (Color LaserJet, 5, 5M, DeskJet) D-5
Ordered Dither and Clustered Ordered Dither
The ordered dither or cluster ordered dither causes a pixel to be
intensified at a point (x,y) depending on the desired intensity, I(x,y),
and on an n x n dither matrix, D, where:
i = x modulo n
j = y modulo n
For RGB color spaces, if I(x,y) < D(i, j), the point corresponding to
(x,y) is intensified; otherwise it is not. The intensity of each primary
color is determined according to this scheme. The relationship
between I and D depends on the specified color space.
Monochrome Rendering
Monochrome rendering generates a gray value from the three
primary colors. The gray value is computed according to the NTSC
standard, which for the Device RGB color space is:
Gray = 0.3 x Red 0.59 x Green 0.11 x Blue
User-Defined Dithering
For a user-defined dither, the input primaries are compared against
differently dimensioned dithers (e.g. MxN), which may vary for each
primary color.
Note Render algorithms 1, 2, 9 and 10 are not accessible when in a
device-independent color space because it is impossible to
characterize a printer for all possible dither algorithms. If one of these
render algorithms is selected when in a device-independent color
space, the device best dither algorithm will be used instead.
HP Color LaserJet 5 and 5M printers do not support user-defined
dithering.
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