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PostScript
Guide to Using Page Description Languages 1-23
Scan conversion details
DocuPrint NPS/IPS uses the scan conversion rules to control the
PostScript painting operators
stroke
,
fill
,
clip
, and
image
.
The scan conversion process and rules are not defined as part of
the PostScript language. They are subject to variations
depending on algorithms used in different PostScript printing
devices to achieve the most accurate rendition possible. The
sections below describe the stroke and fill operators.
Stroke
Stroke refers to painting a line that follows the current path, is
centered on the path, and has sides parallel to the path segment.
“Path” includes a thickness set by the operator
setlinewidth
.
DocuPrint NPS/IPS turns on any device pixels whose centers lie
within the width of the path to be stroked. The pixels whose
centers lie outside of the width of the path are turned off.
Figure 1-4. Stroke function
The top illustration above shows four columns of three pixels on
the printing device. The dashed lines intersect at the center
points of the device pixels or dots. The columns from left to right
are designated as columns 1, 2, 3, and 4.