SGI2FAX(1)						      General Commands Manual							SGI2FAX(1)

NAME

       sgi2fax - convert a Silicon Graphics image file for facsimile transmission

SYNOPSIS

       /usr/lib/fax/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 guaranteed 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, respectively.  Greyscale images are then process with a high pass filter and dithered to a
       bilevel image.  The resultant 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 resolution.	The image is writ-
       ten 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 resolution.  know as low resolution.

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

       -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 pagesizes(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 Executive), jp-let  (Japanese  Let-
	      ter), and jp-leg (Japanese Legal).  Comparisons are case-insensitive and any match of a substring of the full page-size name is suf-
	      ficient; e.g. ``legal'' would match ``American Legal''.

FILES

       /usr/lib/fax/pagesizes  page size database

SEE ALSO

       hylafax-client(1), sendfax(1), hylafax-server(5F)

								   June 14, 1994							SGI2FAX(1)