Sun rasterfile to sgi image conversion needed

[GILHULY at krdc.int.alcan.ca]

I am in need of a conversion process to take Sun rasterfiles (screendumps, for
example) and convert them to SGI images.  This process is needed to work on
a Sun 386i preferably, or a Sun Sparc workstation.

Up until now I have been trying to use TIFF to do this but for some reason my
system fails to recognize the attribute CANVAS_COLOR24.  So, alternately, I am
also looking for a conversion process from Sun raster to TIFF (TIFF to SGI is
working fine from what I am told).

I can be reached on internet at
     gilhuly at krdc.alcan.int.ca