Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!unido!fauern!fauern!lsmichae
From: lsmichae@medusa.informatik.uni-erlangen.de (Lars Michael )
Newsgroups: comp.graphics
Subject: Re: IFF 24 bit images
Keywords: question
Message-ID: <3367@medusa.informatik.uni-erlangen.de>
Date: 13 Dec 90 10:04:02 GMT
References: <18648@netcom.UUCP>
Organization: CSD, University of Erlangen, W-Germany
Lines: 21

allanh@netcom.UUCP (Allan N. Hessenflow) writes:

>I'm looking for information on the format of IFF 24 bit images.  I have
>PBM & FBM, both of which will read IFF ILBM ham mode images; while I was
>looking for sample images to test a reader in ham mode I kept finding
>images which claim to be "IFF 24 bit images."  While I'm asking, are there
>any other types of IFF images besides 1-8 bit mapped, ham, and 24 bit?

The IFF ILBM format is independent from the number of bitplanes. 

An IFF file has different types of data blocks, called _chunks_. Now you have
one chunk - I think it's CMAP-chunk (color map). This chunk has a description
of the bit image. E. g. picture width and height and if compression is used or
not. Actually you have there a byte which contents the number of (used)
planes.

If you want more info and if you have ftp you can get a whole description of
the InterchangeFileFormat a titan.rice.edu in /public/graphics.formats.

"May the Schwartz be with you"
								Lars