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10/10/03
CHAPTER 6 EPSON - 23
6.7. Graphics
Select image mode
Esc*mn1n2<image data> (27)(42)mn1n2.... <1Bh><2Ah>mn1n2....
• This command enables you to define and print a single line raster bit image on a single text line at a
selected horizontal resolution.
• n
1
and n
2
define the number of bytes that comprise the image.
• The image consists of 256*n
2
+n
1
bytes of data, each byte representing a single vertical column of
4/30".
• m defines the horizontal resolution at which the image will be printed. m must be in the range 0 to 7.
A value of 0 selects 60 dots per inch, 1 and 2 select 120 dots per inch, 3 selects 240 dots per inch, 4
selects 80 dots per inch, 5 selects 72 dots per inch, 6 selects 90 dots per inch and 7 selects 144 dots
per inch.
• Each byte represents a vertical column of eight dots, the most significant bit representing the dot at
the top. Simply set a bit to 1 if you want a dot to appear in that position, and to 0 if you want white
space to appear.
• Images are printed left to right.
• Images are printed at a horizontal resolution determined by your selection and at an approximate
vertical resolution of 72 dots per inch. The printer attempts to match your chosen horizontal
resolution as best it can using its 600 dpi resolution.
•
You can only use this command in portrait orientation.
10 WIDTH “LPT1:”,255
20 LPRINT “*** ESC * m n1 n2 ***”
30 FOR M=0 TO 6
40 LPRINT “m=”;M
50 ‘* SELECT BIT IMAGE MODE *
60 LPRINT CHR$(27);”*”;CHR$(M);CHR$(240);CHR$(0);
70 FOR I=1 TO 8
80 N=2^I-1
90 FOR J=1 TO 30
100 LPRINT CHR$(N);
110 NEXT J:NEXT I:LPRINT
120 NEXT M:END
*** ESC * m n1 n2 ***
Sample 9
Reassign image mode
Esc?cm (27)(63)cm <1Bh><3Fh>cm
• This command enables you to redefine the horizontal resolution attached to a particular image mode.
Hence, you could assign a density of 90 dots per inch to the image mode normally associated with 60
dots per inch, which is selected with the Esc K command. All subsequent Esc K commands would
then generate images with a horizontal density of 90 dots per inch.
• c is the character which signifies the graphics mode: K = single-density (60 dpi), L = double-density
(120 dpi), Y = double-speed, double-density (120 dpi) and Z = quadruple-density (240 dpi).
•
m defines the new horizontal resolution to be assigned to the specified graphics mode. m must be in
the range 0 to 7. A value of 0 selects 60 dots per inch, 1 and 2 select 120 dots per inch, 3 selects 240
dots per inch, 4 selects 80 dots per inch, 5 selects 72 dots per inch 6 selects 90 dots per inch and 7
selects 144 dots per inch.
LPRINT CHR$(27); CHR$(63); CHR$(90); CHR$(7); 'Change quad density to
144 dpi