Path: utzoo!utgpu!water!watmath!clyde!att-cb!att-ih!pacbell!ames!ll-xn!oberon!pollux.usc.edu!papa
From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga
Subject: Re: Help with HAM & EHB in IFF
Keywords: Same as above...
Message-ID: <7498@oberon.USC.EDU>
Date: 8 Mar 88 17:10:35 GMT
References: <517@wuphys.UUCP>
Sender: news@oberon.USC.EDU
Reply-To: papa@pollux.usc.edu (Marco Papa)
Organization: Felsina Software, Los Angeles, CA
Lines: 24

In article <517@wuphys.UUCP> lel@wuphys.UUCP (Lyle E. Levine) writes:
>
>Hi All!
>	I have almost finished a library I've been working on for
>low these many weeks, and I need some help.  I was sticking in
>some routines for saving specified screens in IFF format and other
>routines for displying such images.  However, I can't find the
>accepted way for indicating that the image is in HAM or EHB mode.
                                                  ^^^^^^^^^^
>I could assume 6 bit planes = HAM but this would be a TERRIBLE thing
>to have to do!!!  Sould I send in for more recent IFF docs?
>	Of course, if someone could mail me his/her sources for such
>things I would be ETERNALLY GRATEFUL.  My present coding is built
>around the code from the IFF disk... (Argh).

The HAM, EHB, or Dual Playfield information should be stored in a "CAMG"
chunk, which is specific to the Commodore Amiga. This is a LONG "Amiga
Viewmode". This chunk is also used for properly storing the "overscan"
or PAL/NTSC size.  An example of proper use is in the ScreenSave program 
by Carolyn Scheppner included in the latest IFF disk from CATS.  Also some
extra information on changes to that document is available on page 4 of the
September/October issue of AmigaMail.

-- Marco