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the unprinted neighboring pixels. Error diffusion applies
only to raster data printed using the Configure Image Data
command.
Ordered/Clustered 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 Since it is impossible to characterize a printer for all
possible dither algorithms, render algorithms 1, 2, 9 and 10
are not accessible when in a device-independent color space.
If one of these render algorithms are selected when in a
device-independent color space, the device best dither will
be used instead.
4-4 Modifying Output Color4-4 Modifying Output Color