Sorry it took a while for me to post this summary, but I didn't have any way to
test the programs I obtained as a result of my query.  We don't own a color
PostScript printer, but one of our customers does.  I sent him the "import"
program (described below), and he says that it works just fine.
My original request:
> Does anyone out there know of a Public Domain or Shareware program that
> converts 8-bit Sun rasterfile format into color PostScript?  Thanks.
 
I received references to 5 different packages that (allegedly) do this:
   import    (SUNtoPS)
   pbmplus   (Portable BitMap Plus)
   FBM       (Fuzzy BitMap)
   URT       (Utah Raster Toolkit)
   rle       (??? - maybe the same as URT?)
The first one (import) was sent to me directly by it's author, John Cristy
(<uunet!RELAY.CS.NET!cristy%ESSUN3%ESVAX@dupont.com>).  That's the one that
was sent to our customer and seems to be working fine.  Note that it only
handles Sun Rasterfiles -> Color PostScript, unlike the other packages I found
out about, which handle many different formats.  This isn't necessarily bad,
if that's all you need.  It is certainly easier to use (1-step) than the other
packages.
I FTP'ed, unpacked, and compiled the second package (pbmplus), but I have no
way of testing it, so I can't comment much on it.  It sure does seem to handle
a lot of formats!  See the list, below.
I never found the third package (FBM), but I didn't look very hard either.
By the time I heard about it, our customer was already happy with "import", so
I kind of gave up.
I FTP'ed the fourth package (URT), but I had problems uncompressing it, so I
gave up.
I never found the last package (rle), but I suspect it is another name for the
URT package.
Here are some of the responses I received:
From: John Hasley<uunet!andy.bgsu.edu!hasley>
> Check out the PBMPlus toolkit.  It can convert a large number of
> formats to an intermediate format, manipulate the file, and convert
> back.  It handles Sun, Mac, X11, PostScript, and other formats.  I
> haven't had a chance to verify the color PostScript output (I also
> haven't had a printer), but it *looks* like PostScript.
> 
> It's available for ftp from expo.lcs.mit.edu as contrib/pbmplus.tar.Z
> as well as other places (it's on the X11 distribution tapes.)  It was
> posted to comp.sources.misc last November (1989).
> 
> You also might check FBM (Fuzzy Bitmap) and URT (the Utah Raster Toolkit).
> The one who is responsible for the latter is Spencer Thomas, who is
> presently at U of Michigan.  Both of these handle numerous conversions,
> but last I heard, didn't handle the particular one you want.
From: uunet!ced.berkeley.edu!jeg (James Ganong)
> the rle package from university of utah has converters that
> go
> rast to rle
> and
> rle to color postscript
From: bice@atlantis.ees.anl.gov
> The "Fuzzy Bit Manipulator" does that (yeah, no kidding...  It's really
> named that).  This is the package that makes .FBM files and converts to
> and from several different formats (ppm,pbm,gif,im8,im24,rle,pcx, etc...)  
>
> I forget where we FTP'd it from, but although it had a few bugs (it didn't
> handle GIF very well) it DID make nice (albeit LONG!) postscript files for
> our QMS printer...
From: uunet!Corp.Sun.COM!kevin (Kevin Sheehan {Consulting Poster Child})
> PBM (Portable Bit Map) does it - available from archives everywhere.
>
> PBM handles the following formats:
>
>   Sun icon file				reading	writing
>   Sun raster file				reading	writing
>   X10 and X11 bitmap file			reading	writing
>   MacPaint					reading	writing
>   CMU window manager format			reading	writing
>   MGR format					reading	writing
>   Group 3 FAX					reading	writing
>   X11 window dump file			reading	writing
>   X10 window dump file			reading
>   Xerox doodle brushes			reading
>   GEM .img format				reading
>   PC paintbrush (.pcx) format			reading
>   PICT					reading
>   ASCII graphics					writing
>   HP LaserJet format					writing
>   GraphOn graphics					writing
>   BBN BitGraph graphics				writing
>   Printronix format					writing
>
> PGM handles the following formats:
>
>   TIFF					reading
>   Usenix FaceSaver file			reading
>   HIPS					reading
>   FITS					reading	writing
>   PostScript "image" data			reading
>   raw grayscale bytes				reading
>   Encapsulated PostScript				writing
>
> PPM handles the following formats:
>
>   color Sun raster file			reading	writing
>   GIF						reading	writing
>   Amiga IFF ILBM				reading	writing
>   color X11 window dump file			reading	writing
>   color X10 window dump file			reading
>   MTV ray-tracer output			reading
>   QRT ray-tracer output			reading
>   TrueVision Targa file			reading
>   Img-whatnot file				reading
>   color Encapsulated PostScript			writing
Thanks to the following people for their responses:
   John Hasley<uunet!andy.bgsu.edu!hasley>
   uunet!hub.eng.wayne.edu!rizzo (Frank F. Rizzo)
   "Randal L. Schwartz" <uunet!iWarp.intel.com!merlyn>
   uunet!isoftfr!slt (Stephane Tsacas)
   uunet!ced.berkeley.edu!jeg (James Ganong)
   uunet!ucsd.edu!bridget@millipore (Bridget Carragher)
   uunet!sunkist.West.Sun.COM!ohio!patrick (Patrick O'Shaughnessy)
   bice@atlantis.ees.anl.gov (Brent A. Bice)
   uunet!Corp.Sun.COM!kevin (Kevin Sheehan {Consulting Poster Child})
   John Cristy <uunet!RELAY.CS.NET!cristy%ESSUN3%ESVAX@dupont.com>
 +---------------------------------+-----------------------------------+
 | Drew Montag                     | djm@bioimage.millipore.com        |
 | Senior Software Design Engineer | uunet.uu.net!millidc!bioimage!djm |
 | Bio Image Products              | (800) 624-5394  (toll free)       |
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