Printronix P9000 Series, User'S Reference Manual

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Graphics 4-2
73
146
36
255
36
146
73 DECIMAL
VALUES
128
64
32
16
8
4
2
1
DECIMAL
WEIGHTS
7th BIT IMAGE DATA BYTE
2nd BIT IMAGE DATA BYTE
1st BIT IMAGE DATA BYTE
Figure 4-1. Bit Image Pattern Plan
How Bit Image Graphics Are Produced
The binary data byte bit pattern for the ASCII character A" (hex 41, decimal 65) is pictured in
Figure 4-2.
D If this data byte is rotated clockwise, the result is a vertical data byte pattern with the
most significant bit (MSB) at the top.
D If each 1" or true bit is plotted, the result is a bit image plot of the ASCII character
A."
The relationship of ASCII character, decimal value, and Bit Image plot is shown in Figure 4-3.
D The data bytes can be identified by their binary, octal, hexadecimal, or decimal
equivalents. These are used to generate a Bit Image pattern.
D Bit Image plotting is not limited to printable ASCII characters; Bit Image patterns
can be plotted for any 8-bit data byte with decimal values ranging from 0 to 255.
D The standard ASCII character chart and its equivalents is provided in Appendix A.
NOTE: Bit Image Graphics is recommended in the DP print mode (120 X 72 dpi). VertiĆ
cal density variation in other print modes may cause white horizontal bars or overlapping
of adjacent graphics lines; however, changing the line spacing can correct this problem.