Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!ames!apple!well!shf
From: shf@well.UUCP (Stuart H. Ferguson)
Newsgroups: comp.sys.amiga.tech
Subject: Re: IFF: CAMG, ViewMode.
Message-ID: <12085@well.UUCP>
Date: 9 Jun 89 04:36:32 GMT
References: <19199@cup.portal.com>
Reply-To: shf@well.UUCP (Stuart H. Ferguson)
Distribution: usa
Organization: The Blue Planet
Lines: 19

+-- stephan@cup.portal.com (Stephen Derek Schaem) writes:
|  And why some file dont have have a CAMG chunk! I have the Overscan routines
| writen also, just that Viewmode thing.
|  Well, any info on CAMG and how ushow set the viewmode will be greatly 
| apreciated!

As I understand it, ILBM.CAMG is an optional property chunk.  This means that
files do not have to have it.  The only bits you should really look at (and
save!) in the CAMG word are the HAM and HALFBRIGHT bits.  The way to decide
if the image should be displayed as interlace or not is to look at the
aspect ratio and image size in the BMHD property.  The BMHD is always
provided -- if not, the ILBM is broken.

What screen size and combination of HIRES and LACE to use for a given set
of aspect ratio and image size information is left as an exersize for the
reader.
-- 
		Stuart Ferguson		(shf@well.UUCP)
		Action by HAVOC