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Chapter 7. Dec LG/Compaq LG Plus Emulation GEK-00029B
168
SIXEL Sixel Graphics:
This sequence provides a group of 6 bit bytes to
be used as vertical graphics data. A bit value of 1 means print a pixel,
while a bit value of 0 means leave a blank. The Device Control String
(DCS) envelope contains the graphics introducer and all graphics data.
This envelope is initiated using the DCS control character and is
terminated with the String Terminator (ST) control character. The Sixel
protocol components are made up of the String Introducer, Protocol
Selector, Picture Data, and String Terminator. The Protocol Selector
consists of a string of 0, 1 or more numeric parameters separated by
the semicolon character (3BH).
The overall command format is the following:
DCS
Ps1
;
Ps2
;
Ps3
…
Psn
q
Sixel data
ST
The Protocol Selector is that portion of the form:
Ps1
;
Ps2
;
Pn3
…
Pn
q.
Hex: 90
Ps1
3B
Ps2
3B
Pn3
…
Pn
q <sixel data> 9C
Ps1
selects the horizontal grid size and aspect ratio, this will
implicitly define the vertical grid size. The following table defines the
parameter selections.
Ps1
Horizontal
DPI
Vertical
DPI
Aspect
Ratio
0 100 50 200:100
1 100 50 200:100
2 200 50 400:100
3 200 65 300:100
4 100 40 250:100
5 100 50 200:100
6 67 45 150:100
7 67 55 120:100
8 50 45 110:100
9 50 50 100:100
Ps2
is the background select parameter. It is not used by this printer.
Ps3
selects the horizontal grid size in decipoints. This parameter,
used with the aspect ratio, defines grid size. The following table
identifies the horizontal grid size used for each parameter value.
Ps3
Horizontal
DPI
0No Change
1240
2240
3240
4180
5140
6120
7120
890
990
10 70
11-19 60