Graphics; C.2.7 Graphics - Epson PR9 User Manual

C.2.7

Graphics

The printer can operate in Bit Image Mode (bit map printing), to create illustrations and
diagrams. In this way, the image is created by printing each byte received as a vertical
line of 8 dots. A dot is printed for each bit set to "1" in the byte sent.
The least significant bit corresponds to the lowest dot on the line, while the most
significant bit corresponds to the highest dot.
The graphic print commands only apply to one print line. The line end command CR/LF is
only recognized when the printer leaves graphic printing to return to alphanumeric
printing. As a result, the number of bytes that can follow a command for graphics is limited
by the maximum capacity of a print line (and the graphic resolution). The data that
exceeds the capacity of the line buffer is ignored.
The graphic commands must therefore be repeated for each print line, if you want to print
an image consisting of several lines.
One line can contain both alphanumeric and graphical characters. To calculate the space
that the alphanumeric characters occupy inside the graphics, a table is provided later on.
BIM Data/Capacity of the print line with various resolutions
BIM Resolution
Normal (ESC K)
Double (ESC L, ESC Y)
Quadruple (ESC Z)
Space occupied by characters inside BIM data
The table below shows the relationship between the space occupied (as a number of
bytes) by a normal character inside a mixed print line (text + graphics).
BIM resolution:
Pica (10 cpi)
Elite (12 cpi)
Condensed (17.1 cpi)
Appendix C IBM ProPrinter X24 and IBM ProPrinter II Commands
80 columns
480
960
1920
Normal Double
6 12
5 10
3.5 7
Quadruple
24
20
14
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