Article View: comp.sys.amiga.tech
Article #74Re: CAMG
From: Joe Smith
Date: Thu, 15 Jun 1989 05:57
Date: Thu, 15 Jun 1989 05:57
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1792 bytes
I write:
>>If an IFF picture is EXTRA_HALFBRITE or HAM, then the CAMG chunk is
>>mandatory.
In article <SHADOW.89Jun13210417@daniel.pawl.rpi.edu> shadow@pawl.rpi.edu
(Deven T. Corzine) writes:
>Still not mandatory, but certainly foolish to omit.
Agreed. If a picture has 6 bit planes but only 16 colors are defined, then it
can be assumed that the picture is uses Amiga's HAM mode. And one can assume
that 6 bit planes and 32 colors implies extra-halfbrite. But I hate having to
make assumptions. We all know the joke about what "assume" means.
To be really complete, an IFF file of an extra-halfbrite picture should have
entries for 64 color registers. That is so that non-Amiga IFF readers can
treat it like a normal 6 bit plane image. With the half-brite colors defined,
the CAMG chunk is not really mandatory.
--
Joe Smith (408)922-6220 | SMTP: JMS@F74.TYMNET.COM or jms@tymix.tymnet.com
McDonnell Douglas FSCO | UUCP: ...!{ames,pyramid}!oliveb!tymix!tardis!jms
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!oliveb!tymix!tardis!jms From: jms@tardis.Tymnet.COM (Joe Smith) Newsgroups: comp.sys.amiga.tech Subject: Re: CAMG Summary: Number of colors for 6 bit planes Message-ID: <260@tardis.Tymnet.COM> Date: 15 Jun 89 05:57:27 GMT References: <1373@psueea.UUCP> <122@snll-arpagw.UUCP> <SHADOW.89Jun11123615@daniel.pawl.rpi.edu> <123@snll-arpagw.UUCP> <SHADOW.89Jun12131122@daniel.pawl.rpi.edu> <253@tardis.Tymnet.COM> <SHADOW.89Jun13210417@daniel.pawl.rpi.edu> Reply-To: jms@tardis.Tymnet.COM (Joe Smith) Organization: McDonnell Douglas Field Service Co, San Jose CA Lines: 22