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From: jbickers@templar.actrix.gen.nz (John Bickers)
Newsgroups: comp.graphics
Subject: Re: IFF? (more like semi-IFF)
Message-ID: <1119.tnews@templar.actrix.gen.nz>
Date: 7 Mar 91 01:02:36 GMT
References: <NV89-NUN.91Mar1104205@alv.nada.kth.se>
Organization: TAP, NZAmigaUG.
Lines: 35

Quoted from <NV89-NUN.91Mar1104205@alv.nada.kth.se> by nv89-nun@alv.nada.kth.se (Nicklas Ungman):
> I've got a copy of Intro to Amiga IFF ILBM Files and Amiga Viewmodes
> and it says that "if the picture is 6 planes deep and has no CAMG chunk,
> it is probably HAM". Is this really correct? If it is, it means I have

    This is an assumption that a person writing a display program is
    supposed to be able to make. People who write programs that save
    ILBMs should be aware of it too.

    It's just a guideline, which is why words like "hopefully"
    appear... :)

> to put a 'CAMG' chunk if I want to save a non-ham 6-bit picture. Does it
> apply to 7 and 8-bit pictures too?

    Saving a CAMG chunk is no big deal. Bad idea if the data does not
    actually fit any Amiga display mode, though.

> I also would like to know if Amiga programs (like DeluxePaint) can handle
> 6, 7, 8 and 24-bit IFF pictures.

    Version II of DeluxePaint can't. Unless a program is supposed to
    know about undisplayable pictures, the chances are good that the
    excess bitplanes will just be ignored. There's also a chance some
    programs will crash, but that's poor programming on the part of
    their authors - I wouldn't worry about it.

> If someone has any answers please post them.

    Ok. Something wrong with email?

> /Nixxon
--
*** John Bickers, TAP, NZAmigaUG.        jbickers@templar.actrix.gen.nz ***
***         "Patterns multiplying, re-direct our view" - Devo.          ***