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From: "Joris" <joris.at.lebbeke@skynet.be>
To: "Cromwell Hooper" <Cromwell@solutions2001.com.au>,
        <tiff@remotesensing.org>
References: <C3B0EB1499789A4B999DB9B5A8A5A41202CECC@mail.solutions2001.com.au>
Subject: Re: [Tiff] G4 1D/2D Decompression - Can't understand the Code :-(
Date: Tue, 8 Mar 2005 01:11:45 +0100
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Cromwell,

> i've just read your  [Tiff] Using TIFFGetField to get a "Rational"
> <http://xserve.flids.com/pipermail/tiff/2004-November/000824.html>
> contribution to the "Tiff" mailing list, for which i didn't notice a
> reply.

Perhaps you should consult the archive over at
http://www.awaresystems.be/imaging/tiff/tml.html, as it has better threading.
Allthough that particular thread spinned out-of-topic, definite answers were
given. See:

http://www.asmail.be/msg0054698123.html
http://www.asmail.be/msg0054669769.html

I notice your pointer to the pipermail archive message doesn't quite match your
subject line or message content. Perhaps you were referring to the next message
in line, in then archive, that one is a better match. It is the equivalent of
http://www.asmail.be/msg0054704587.html in the archive with correct threading.

But the problem presented in that latter post is quite the opposite of what
you're after, if I understand your intentions correctly. It was Michael's
intention to use an existing LibTiff codec to work on raw data without the TIFF
format wrapper. As I understand your message, it is your intention instead to
use an existing independent code to work inside LibTiff, on data with the TIFF
format wrapper. There is not much information about this available on-line. You
should try examining the units tif_codec.c, as this is the place to add
registration of your codec. You'll notice a reference there to the function
TIFFInitDumpMode, this is the function that fully completes registration of the
simplest codec in the package, the 'uncompressed' codec. This function is
specificied in tif_dumpmode.c, the unit for this particular 'uncompressed'
codec, that deserves your close attention. Put breakpoints in the particular
functions there, to see when they are being called. It may also pay off to try
feeding stuff you see there, like 'tif_decoderow' for example, in the archive
search function over at http://www.awaresystems.be/imaging/tiff/tml.html.


Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be/
Download your free TIFF tag viewer for windows here:
http://www.awaresystems.be/imaging/tiff/astifftagviewer.html

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