Contents of fts2gif.tar.gz:

README      - this file
fts2gif.c   - source of my program
raw2gif     - Redhat 6.x/7.x binary from giflib-3.0 package
raw2gif.sol - Solaris binary (rename it to "raw2gif")

"fts2gif.c" is my veeery simple program that reads the FITS file,
computes IRAF's zscale params and pipes raw gray data to "raw2gif"
utility which creates GIF image. There is also a temporary
file "%%fts2gif.PIDNO" created in /tmp, used by "raw2gif" and then
deleted. 

Only 2-dimensional images are supported, no extensions, no binary
tables, just simple images.

Usage:   fts2gif  [-ngray nlevels]  [fts_file [gif_file]]

If argument(s) is omitted, uses stdin/stdout.
The only option, "-ngray" allows to change default number of levels of
gray (32).

"fts2gif" is pretty simple. Also, it can be a memory hog for big images
as it reads the whole image into double array.

I don't think it make do any harm other than accidental overwrite of the
most important file you have :-)) Still, as usual, you use it on your
own (standard disclaimer, blah, blah)

I hope it can be useful. Feel free to modify, enhance etc. the code.
If you add/change something important, let me know.

regards, Michal.

Michal Szymanski (msz@astrouw.edu.pl)