I believe REND24 will load HAM8 images then allow you to render them
into the original HAM format. This program is shareware.
You can also use our ImageFX package, written by the same author as
REND24, to do this as well.
There is a Shareware program called HamLabPlus, last version I know
about is 2.08.4. It can convert just about anything and is available
for download from CIS. I still use it alot, even though I am now in
the process of acquiring ADPro vs 2.5 … I hope this helps