NAME
sgi2fax − convert a Silicon Graphics image file for facsimile transmission
SYNOPSIS
/usr/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 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 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 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(5) 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 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
/etc/hylafax/pagesizes page size database