[comp.sys.atari.st] GEM data file image format wanted.

jstewart@ncs.dnd.ca (John Stewart) (09/26/89)

GEMmers:

I am an IBM user (I know, I know) who uses GEM at work for diagrams and
charts.

I have access to many images, and a converter, but unfortuantely the
"convert to GEM/IMG" part of the formatter does not work.

I assume that the GEM bit mapped image file definition is the same on
PC's and Atari's (why not?).

Can someone send (post, if it has not been covered recently) the
file definition ofa GEM image? I have gone through the last few weeks
worth of mail, and have not found this definition...

Thanks

John Stewart.

saj@chinet.chi.il.us (Stephen Jacobs) (09/27/89)

STWorld has a description of the GEM .img format in the July 1989 issue.  It
contains some slight ambiguities, so I'd start out reading files for a while
before writing them (lest my .img files were unreadable).  But basically the
organization is that each bitplane is written out explicitly in turn (with
some fairly simple compression).
                                  Steve J.