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Graphics4-2
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 P
attern Plan
How Bit Image Graphics Are Produced
The
binary data byte bit pattern for the A
SCII 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 A
SCII character
A."
The
relationship of A
SCII
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 A
SCII 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). V
ertiĆ
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.