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User-Defined
Dithers
The Download Dither Matrix command (?*m#W) can
create a dither matrix for one or all three primary colors,
in effect providing halftone screens. User-defined dither
matrices can be used for optimizing the printer’s output
capabilities when using device-dependent color spaces.
They are ignored for device-independent color spaces,
since the printer cannot be calibrated as is necessary for
device-independent color. User-defined halftones can be
downloaded for each component of the color space.
A user-defined matrix is defined in additive colors (RGB
values). The dither matrix pixels are defined in terms of
device-dependent resolution.
When using the Download Dither Matrix command, you
have several options:
You can choose whether to define a separate matrix for
each color plane, or use the same matrix for all three
color planes.
You set the height and width of the dither cell. When
using separate matrices for each plane, you can use
different size dither cells for each plane. For example,
you can have a 4 x 4 pixel cell for red, a 4 x 6 cell for
green, and a 6 x 8 cell for blue.
You download the data bytes for each pixel of the cell.
Each data byte determines a threshold—every pixel with
a value greater than or equal to the threshold gets
turned on and every pixel with a value less than the
threshold does not get turned on.
Modifying Output Color 4-5Modifying Output Color 4-5