Bit Image Density; Bit Image Pattern Plan - Printronix 9012 User's Reference Manual

Bit Image Density

Bit Image graphics may be printed in different dot densities. Dot densities are selected
by control code:
Control code ESC K selects the Single Density Mode.
Control code ESC L selects the Double Density Mode.
Control code ESC Y selects the Double Speed, Double Density Mode.
Control code ESC Z selects the Quadruple Density Mode.
Single Density Bit Image graphics in the Data Processing print mode are printed at 60
dots per inch (dpi) horizontally and 72 dpi vertically. In the Correspondence print mode,
the horizontal dot density is 90 dpi and vertical density is 96 dpi. In the High Speed mode,
horizontal dot density is 60 dpi and vertical density is 48 dpi.
The Double Density Mode prints up to twice the number of dots per inch horizontally in
the same space as Single Density. The vertical dot density remains the same as in the Sin
gle Density mode. Double horizontal density requires twice the number of input data
bytes to print the same length line as Single Density. Printing double density reduces the
printing speed by half.
When the Double Density, Double Speed control code is received, the data will be
printed at double the current horizontal dot density, but adjacent dots are not printed.
4-2
1st BIT IMAGE DATA BYTE
2nd BIT IMAGE DATA BYTE
DECIMAL
WEIGHTS
128
64
32
16
8
4
2
1
73 36
146 255
Figure 4-1. Bit Image Pattern Plan
7th BIT IMAGE DATA BYTE
36 73 DECIMAL
VALUES
146
P9012 Graphics