1SGI2FAX(1)                  General Commands Manual                 SGI2FAX(1)
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NAME

6       sgi2fax - convert a Silicon Graphics image file for facsimile transmis‐
7       sion
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SYNOPSIS

10       /usr/sbin/sgi2fax [ options ] files...
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DESCRIPTION

13       sgi2fax converts Silicon Graphics format images to bilevel TIFF Class F
14       images  in  preparation  for transmission as facsimile.  sgi2fax is not
15       normally invoked directly; it is usually run by sendfax(1) when an  SGI
16       image file is submitted for transmission.
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18       Images  are  converted  by  scaling  them to fill the guaranteed repro‐
19       ducible area on a default page.  Each  RGB  pixel  p  is  converted  to
20       greyscale according to:
21            pr * %r + pg * %g + pb * %b
22       where  %r,  %g,  and  %b  default  to  30,  59,  and  11, respectively.
23       Greyscale images are then process with a high pass filter and  dithered
24       to  a bilevel image.  The resultant image are written as a TIFF Class F
25       document.
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27       By default, the output image is created with 204  dots/inch  horizontal
28       resolution and 98 lines/inch vertical resolution.  The image is written
29       as Group 3 1D-encoded data.
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OPTIONS

32       -1     (-2) Write the image as Group 3 1D- (2D-) encoded data.
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34       -b %b  Set the %b parameter used  to  convert  color  pixel  values  to
35              greyscale pixel values.
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37       -g %g  Set  the  %g  parameter  used  to  convert color pixel values to
38              greyscale pixel values.
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40       -l     Generate an image at 98 lines/inch vertical resolution.  know as
41              low resolution.
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43       -m     Generate an image at 196 lines/inch vertical resolution.
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45       -o file
46              Write output to file instead of the default file named sgi.fax.
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48       -r %r  Set  the  %r  parameter  used  to  convert color pixel values to
49              greyscale pixel values.
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51       -s size
52              Set the output size according to the named  page  size.   Images
53              are  normally  created  with a system-default page size (usually
54              letter-size pages, 8.5" by 11", for  sites  in  North  America).
55              Alternate page sizes are specified symbolically using either the
56              name or abbreviation of an entry in the pagesizes(5F)  database;
57              e.g.   a3  (ISO  A3),  a4 (ISO A4), a5 (ISO A5), a6 (ISO A6), b4
58              (ISO B4),  na-let  (North  American  Letter),  us-leg  (American
59              Legal),  us-led  (American Ledger), us-exe (American Executive),
60              jp-let (Japanese Letter), and jp-leg (Japanese Legal).   Compar‐
61              isons  are  case-insensitive and any match of a substring of the
62              full page-size name is sufficient; e.g.  ``legal''  would  match
63              ``American Legal''.
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FILES

66       /etc/hylafax/pagesizes  page size database
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SEE ALSO

69       hylafax-client(1), sendfax(1), hylafax-server(5F)
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73                                 June 14, 1994                      SGI2FAX(1)
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