COMBINED MODES OF RASTER GRAPHICS
This program combines three forms of raster compression
to allow the most efficient means of printing a
rectangle with a dot in the middle. The modes of
raster compression illustrated here can be used with
all PCL 5 printers. The LaserJet IIP is capable of
using Run Length Encoded and TIFF, but not Delta Row
Compression.
This program was done using QBasic:
Legend: LPRINT CHR$(27); = Escape in Basic. The
quote marks are syntax parameters and the
semicolon at the end of the line supresses
the carriage return (CR) and line feed
(LF).
WIDTH "LPT1:",255 This command prevents
basic from inserting an
unwanted carriage return
after 80 characters are
printed.
LPRINT CHR$(27);"E"; Printer reset.
LPRINT CHR$(27);"*p900x1200Y"; Position cursor 900
dots in from the left
edge of the logical page
and 1200 dots down from
the default top margin.
LPRINT CHR$(27);"*t75R"; Set raster resolution to
75 dots per inch.
LPRINT CHR$(27);"*r0F"; Print raster image in the
orientation of the
logical page. This
command is not used with
the Series II or earlier
printers.
LPRINT CHR$(27);"*r1A"; Begin raster graphics at
the current cursor
position.
LPRINT CHR$(27);"*b1m2W";
CHR$(6);CHR$(254); Specifies Run-Length
Encoding as the form of
raster compression and
tells the printer to
interpret two bytes as
raster data.
LPRINT CHR$(27);"*b1m6W";
CHR$(0);CHR$(192);CHR$(4);
CHR$(0);CHR$(0);CHR$(6); Specifies Run-Length
Encoding to print the
following:-zero
repetitions (one
occurrence) of byte (192)-
four repetitions of byte
(0) (five occurrences)-
zero repetitions (one
occurrence) of byte (6)
LPRINT CHR$(27);"*b3m0W"; Use Delta Row Compression
to repeat the previous
seed row.
LPRINT CHR$(27);"*b3m0W"; Repeat Row.
LPRINT CHR$(27);"*b3m2W";
CHR$(3);CHR$(24); Use Delta Row Compression
to print the following:
-replace one byte offset
by three from the
original byte with byte
value (0).
LPRINT CHR$(27);"*b3m2W";
CHR$(3);CHR$(0); Use Delta Row Compression
to print the following:
-replace one byte offset
by three from the
original byte with byte
value (0).
LPRINT CHR$(27);"*b3m0W"; Repeat the previous seed
row.
LPRINT CHR$(27);"*b3m0W"; Repeat the previous seed
row.
LPRINT CHR$(27);"*b1m2W";
CHR$(6);CHR$(254); Specifies Run-Length
Encoding as the form of
raster compression and
tells the printer to
interpret two bytes as
raster data.
LPRINT CHR$(27);"*rB"; End raster graphics.
LPRINT CHR$(27);"E"; Resets the printer and
ejects the page.
End End Program.
Copyright Hewlett-Packard Co. 1993
The information contained herein is subject to change
without notice.
Hewlett-Packard shall not be liable for incidental or
consequential damages in connection with the use of this
material.