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User's Manual
5.1.4.3
SCREENING TAB
1. Use printer's default screens: the frequency, angle and dot shape that are
specified in the EPS file will be used while ripping and printing. If this box is
unchecked, then those parameters can be changed for different effects.
2. Ink: Use the same shape and frequency for all colors, otherwise unexpected
patterns will appear in the design.
3. Frequency: The frequency is the 'line frequency' (lpmm or lpi). This parameter
determines the size of the cell in which dots are put together to create the
colors. Do not confuse this term 'dots per mm' (dpmm or dpi). Dpmm is the
resolution of the printer. The head of a DC4 has a fixed resolution of 12 dpmm
(304 dpi). The number of shades depends on the relation between dpmm and
lpmm (lpi and dpi). The formula is (dpmm/lpmm)² or (dpi/lpi)².
recommended to use only frequencies between 0.8 and 2 lines /mm (20 to 50
lines/inch). Below is an example of printing out a gradient from 100 to 0%
black with respectively 1,1.55, 2.35 lpmm (25, 40 and 60 lpi) and a smooth
gradient
5-11
FIG 5-14
SCREENING TAB
FIG 5-15
DIFFERENCE BETWEEN LINE FREQUENCIES
DC4
It is
Printing Software
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