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D-8 Modifying Output Color (Color LaserJet, 5, 5M, DeskJet) EN
A downloaded user-defined dither will not take effect until after
explicitly selecting it via a render algorithm command with a value of 9
or 10. However, if the current render algorithm (or last render
algorithm received) was a user-defined algorithm (value 9 or 10), then
a user-defined matrix will take effect as soon as it is downloaded. In
this case, another render algorithm command (value 9 or 10) is not
needed to “select” the downloaded user-defined dither matrix. This is
due to the fact that the downloaded user-defined dither algorithm is
the currently selected render algorithm.
If the command is sent before downloading a user-defined dither
matrix, the device will use the device's user-defined dither default, if
available, or, if no default is available, will use the default render
algorithm.
Note The user-defined dither matrix must be defined for processing with
additive colors (RGB).
Since user-defined algorithms cannot be used when a
device-independent color space is active, trying to specify a
user-defined algorithm in this situation causes the default algorithm to
be used. The default is used until the algorithm is changed to
something other than user-defined, or until you specify a
device-dependent color space.
The table below shows the format for a dither matrix that is applied to
all three color primaries. The format for “multiple dither matrices” is
supplied after this explanation. (“uint 16” means unsigned 16-bit
integer; “ubyte” means unsigned byte.)
Byte 15 (msb) 8 7 (lsb) 0 Byte
0 Format = 0 Number of planes = 1 1
2 Dither matrix height in pixels (uint 16) 3
4 Dither matrix width in pixels (uint 16) 5
6 byte #0 (ubyte) byte #1 (ubyte) 7
8 byte #2 (ubyte) byte #3 (ubyte) 9
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