SGI2FAX(1)

NAME
       sgi2fax  -  convert a Silicon Graphics image file for fac-
       simile transmission

SYNOPSIS
       /usr/local/sbin/sgi2fax [ options ] files...

DESCRIPTION
       sgi2fax converts Silicon Graphics format images to bilevel
       TIFF  Class  F  images  in preparation for transmission as
       facsimile.  sgi2fax is not normally invoked  directly;  it
       is  usually  run  by  sendfax(1) when an SGI image file is
       submitted for transmission.

       Images are converted by scaling them to fill  the  guaran-
       teed  reproducible area on a default page.  Each RGB pixel
       p is converted to greyscale according to:
            pr * %r + pg * %g + pb * %b
       where %r, %g, and %b default to 30, 59,  and  11,  respec-
       tively.   Greyscale  images  are  then process with a high
       pass filter and dithered to a bilevel image.   The  resul-
       tant image are written as a TIFF Class F document.

       By default, the output image is created with 204 dots/inch
       horizontal resolution and 98 lines/inch  vertical  resolu-
       tion.  The image is written as Group 3 1D-encoded data.

OPTIONS
       -1     (-2)  Write  the image as Group 3 1D- (2D-) encoded
              data.

       -b %b  Set the %b parameter used to  convert  color  pixel
              values to greyscale pixel values.

       -g %g  Set  the  %g  parameter used to convert color pixel
              values to greyscale pixel values.

       -l     Generate an image at 98 lines/inch vertical resolu-
              tion.  know as low resolution.

       -m     Generate  an image at 196 lines/inch vertical reso-
              lution.

       -o file
              Write output to file instead of  the  default  file
              named sgi.fax.

       -r %r  Set  the  %r  parameter used to convert color pixel
              values to greyscale pixel values.

       -s size
              Set the output size according  to  the  named  page
              size.   Images  are normally created with a system-
              default page size (usually letter-size pages,  8.5"
              by  11",  for  sites  in North America).  Alternate
              page sizes are specified symbolically using  either
              the  name  or abbreviation of an entry in the page-
              sizes(5F) database; e.g.  a3 (ISO A3), a4 (ISO A4),
              a5  (ISO  A5),  a6  (ISO  A6),  b4 (ISO B4), na-let
              (North American Letter), us-leg  (American  Legal),
              us-led  (American  Ledger), us-exe (American Execu-
              tive),  jp-let  (Japanese   Letter),   and   jp-leg
              (Japanese Legal).  Comparisons are case-insensitive
              and any match of a substring of the full  page-size
              name  is  sufficient;  e.g.  ``legal''  would match
              ``American Legal''.

FILES
       /usr/local/lib/fax/pagesizes  page size database

SEE ALSO
       hylafax(1) sendfax(1) hylafax(5F)