User guide

Sixel Graphics Considerations on the LA600 MultiPrinter
21.1 Graphics Resolution
The printer attempts to preserve the requested aspect ratio without exceeding
the requested horizontal grid size (as defined by Pn3 of the protocol selector).
The aspect ratio is provided by Ps1 or Set Raster Attributes (DECGRA).
First the printer ensures that the aspect ratio is one of the supported values
(1:1, 2:1, 2.5:1):
• If aspect ratio is less than 1.5:1, fall back to 1:1
• If aspect ratio is greater than or equal to 1.5:1 and less than 2.25:1, fall
back to 2:1
• If aspect ratio is greater than or equal to 2.25:1, fall back to 2.5:1
Then the printer computes the HGS and VGS values that best match the
aspect ratio and requested Pn3 value.
Table 21–2 Graphics Grid Size Fallbacks
Vertical Grid Size by Aspect
Ratio with HGS Fallbacks (If Any)
Pn3
Decipoints
Horizontal
Grid Size 1:1 2:1 2.5:1
0 or none No change to HGS and VGS defined by Ps1
1–3 Fallback to 4 decipoints
4 1/180" 1/180" 1/90" 1/72"
5 1/144" VGS fallback
to 1/180"
HGS fallback
to 1/180"
1/72" VGS fallback
to 1/72"
HGS fallback
to 1/180"
6, 7 Fallback to 5 decipoints
8 1/90" 1/90" 1/45" 1/36"
9 Fallback to 8 decipoints
10 1/72" 1/72" 1/36" VGS fallback
to 1/36"
HGS fallback
to 1/72"
11–19 Fallback to 10 decipoints
20 1/36" 1/36" VGS fallback
to 1/36"
HGS fallback
to 1/72"
VGS fallback
to 1/36"
HGS fallback
to 1/90"
> 20 Fallback to 20 decipoints
21–2 Sixel Graphics Considerations on the LA600 MultiPrinter