_______________________________________________________________________________
ASPect "n" Default: 2 (576)
Mode: FAX Host: AY
_________________________________ Parameters: _________________________________
"n" - 1 to 6, specifying the number of FAX scan lines the PK-232 prints out
of every 6 lines received.
_______________________________________________________________________________
ASPECT controls the aspect ratio of the length to the width of a FAX image by
controlling the number of lines the PK-232 prints out of each 6 received lines.
On most weather charts, the default of ASPECT 2 keeps the shapes received in the
right proportion. On other transmissions, you may want more resolution.
See the table below for suggested settings.
CCITT IOCs for narrow and wide carriage printers are given for each ASPECT
setting below.
ASPECT CCITT IOC (narrow) CCITT IOC (wide)
1 1100 1788
2 550 (Weather Charts 576) 894
3 367 (Wirephotos 352) 596 (Weather Charts 576)
4 275 (WEFAX Satellite 288) 447
5 220 358 (Wirephotos 352)
6 183 298 (WEFAX Satellite 288)
The Index Of Cooperation, or IOC is an international measure of aspect ratio.
The formula for the CCITT IOC is:
(vertical scan line density) X (horizontal width)
_________________________________________________
3.14159
Weather charts are transmitted at a nominal CCITT IOC of 576. ASPECT 2 is so
close to this that the charts print with no noticeable distortion.
Please note that high settings of ASPECT such as 6 may generate data so often
that your printer cannot handle the high data rate.
8/91 A-16
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