Halftone Dots; Halftone Dot Shapes; Solid Background Printing - Xerox DocuColor 5252 Operator's Manual

Halftone dots

Halftone dot shapes

Solid background printing

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Halftone dots are combinations of spots that create a printed dot.
The dots shown here demonstrate different print resolutions. The
illustration on the left contains 25 possible printer dot cells, which
can create different gray values. The illustration on the right
contains 256 printer dot cells, which allows for a greater range of
grays. To print a visually convincing halftone image, you need at
least 150 shades of gray.
Because toner reacts differently with different paper surfaces, the
characteristics of your paper generally determine the screen ruling
you should use (for example, dry ink/toner tends to spread on
rough, absorbent grades of paper). Different dot shapes can
enhance and improve output quality.
Image quality is affected by the capabilities of your output device
and the type of paper, or media, you are using. Keep in mind the
following regarding the digital press:
• The maximum dry ink/toner coverage is 270 percent.
• The maximum color depth is 256 levels per color.
• The maximum color resolution is 600 dpi.
Media To obtain sharp and uniform prints, paper stocks should be
smooth and be composed of uniformly distributed fibers. Paper
formation is determined by the uniformity of paper fiber
distribution. In color printing, paper formation influences the
tendency to mottle, produce uneven spotty toner coverage, and in
solid backgrounds it determines the sharpness of the color and its
saturation.
Xerox media have been designed with evenly distributed fibers in
its structure to yield crisp and mottle-free prints.
Paper quality can vary from one side to another. Good quality
paper reduces these differences. Many suppliers use arrows on
the paper ream label to indicate the preferred side for imaging.
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