Printronix P9000 Series manual How Bit Image Graphics Are Produced, Bit Image Pattern Plan

1st BIT IMAGE DATA BYTE

2nd BIT IMAGE DATA BYTE

7th BIT IMAGE DATA BYTE

DECIMAL

WEIGHTS

128

64

32

16

8

4

2

1

73	36	36		73	DECIMAL
					VALUES
146	255		146

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.

DIf this data byte is rotated clockwise, the result is a vertical data byte pattern with the most significant bit (MSB) at the top.

DIf 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.

DThe data bytes can be identified by their binary, octal, hexadecimal, or decimal equivalents. These are used to generate a Bit Image pattern.

DBit 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.

DThe 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). Verti/ 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.

4-2 Graphics