Bit Image Density - Printronix P6000L User's Reference Manual

BIT IMAGE
DATA BYTE
st byte
1
nd
2 byte
rd
3 byte
th
4 byte
th
5 byte
th
6 byte
th
7 byte

Bit Image Density

Bit Image graphics may be printed in different dot densities 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.
In Single Density Bit Image graphics from the Data Processing print mode, printed dot density
is 60 dots per inch (dpi) horizontal and 72 dpi vertical. From the Correspondence print mode,
horizontal dot density is 120 dpi and vertical density is 144 dpi.
The Double Density mode prints up to twice the number of dots per inch horizontally (up to
120 dpi from the Data Processing mode). The vertical dot density remains the same as in the
Single Density mode. Double horizontal density requires twice the number of input data bytes
to print the same length line as Single Density. Printing the additional dots reduces the printing
speed by half.
When the Double Density, Double Speed control code is received, the data can be printed up
to double the current horizontal dot density but all adjacent dots are removed which will affect
the final density of the printed image. Since double density graphics are printed at half speed,
double density double speed graphics are printed at the same speed as single density graphics.
Quadruple Density graphics is printed by pairing adjacent bit image bytes. The paired data is
then printed in the Double Density mode
4-4
Table 4-1. Example Bit Image Pattern Decimal Values
DECIMAL WEIGHT
64 + 8 + 1
128 + 16 + 2
32 + 4
128 + 64 + 32 + 16 + 8 + 4 + 2 + 1
32 + 4
128 + 16 + 2
64 + 8 + 1
DECIMAL VALUE
= 73
= 146
= 36
= 255
= 36
= 146
= 73
Graphics