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FORMS LAYOUT CONSIDERATIONS
5-4 XEROX DOCUPRINT 96/DOCUPRINT 96MX LPS FORMS CREATION GUIDE
Scan line density
“Scan line” density is dependent upon printer speed and imaging
speed. Therefore, it can vary with each product and even with
different configurations of the same product. The basic limitation is
linked to dispatchable items, which become visible in character count
and number of lines.
Line density errors Both characters and lines contribute to the dispatchable item count.
When one dispatchable item is superimposed over another
dispatchable item, the result is considered to be two dispatchable
items by the system. When too many dispatchable items are present
on a scan line on the long axis of the paper, the LPS operating
system displays a line density error message:
OS6950 LINE DENSITY EXCEEDED
There is a hardware limitation of 320 dispatchable items per 300-spi
scan line (640 for 600 spi), which includes the required overhead of
two dispatchable items. For example, a dispatchable item could be a
maximum of 32 dots wide for 300 spi (64 dots for 600 spi) and thus
might be a full character (less than point size 8 or 9), a fraction of a
character (greater than point size 8 or 9), or a line segment that is
equal to or smaller than 32 dots in the scan direction.
Determining line density limitations The following is a guide for determining 300-spi line density
limitations. If printing at 600 spi, the same size character or same
length line will have twice as many dots.
• Each 32 dots (or fraction thereof) of a line drawn on the long
axis of the paper is one dispatchable item.
• Each line drawn on the short axis of the paper is one
dispatchable item.
• Each active character is at least one dispatchable item. (An
active character includes all the space from the top of the
character cell to the bottom of the character cell, even if there is
only white space present on a given scan line.) If the dimension
along the scan line is greater than 32 dots, the character
consists of some multiple dispatchable items.
It is not possible to construct a form with two adjacent lines if both use
the full count of 318 (320 minus the two required for overhead)
dispatchable items resulting from text and lines. The imaging system
requires a rest period of about four scan lines before it can image the
second fully loaded line.
As discussed below, line density restrictions differ as a function of the
mode (landscape or portrait) of the form.