Message-ID: 38080740.23AD1B7C@rampnet.com
To: Thomas E Deweese <deweese@kodak.com>
Subject: Re: TIFF Version validation
From: Jaya krishnan Chathu <cjk@rampnet.com>
Date: Sat, 16 Oct 1999 10:34:00 +0530
CC: Tom Lane <tgl@sss.pgh.pa.us>, Bill Comstock <comstock@fas.harvard.edu>, Tiff Mailling list <tiff@olympiakos.com>
References: <"3.0.3.32.19991014105511.0127a1b8"@pop.fas.harvard.edu> <29986.939947610@sss.pgh.pa.us> <14343.25184.509572.158778@gargle.gargle.HOWL>
Sender: owner-tiff@olympiakos.com


I am in a process of writing one such a tool. Can anyone point out me 
where i can get different flavored sample tiff files.

-cjk-


Thomas E Deweese wrote:
> 
> >>>>> "TL" == Tom Lane <tgl@sss.pgh.pa.us> writes:
> 
> TL> Bill Comstock <comstock@fas.harvard.edu> writes:
> >> I'm interested in putting a large collection of TIFF images through
> >> a validation process, one that tests each image against a series of
> >> rules and reports whether it conforms to the TIFF standard [...]
> 
> TL> A more useful way to look at things is a profile of features
> TL> required to decode any particular TIFF --- for example, if your
> TL> program said "tiled TIFF using LZW compression and containing
> TL> 24-bit RGB data", that would convey helpful information.  You
> TL> can't usefully boil it down to "version 5.0" (or whichever spec
> TL> release was the first one to mention all of those features),
> TL> because almost no decoder supports the *whole* spec of any
> TL> release.
> 
>         Admittedly talking about 'versions' of Tiff is not real
> correct (I prefer to talk about 'flavors', but profiles also works).
> But a good tool to at least validate baseline Tiff files would, I
> think, be very useful.  If the tool could check the validity some of
> the more common profiles, tiled, alpha channels, extra samples,
> alternate color spaces - 'inks support', various compression sets,
> would be really welcome.
> 
>         I think that many of us have had the experience of reading the
> TIFF spec. and doing our darn best to implement to what it says, but
> over looking this or that little detail, and always wondering if we
> were writing out subtlety 'corrupt' Tiff files.
> 
> --
>                                                         Thomas DeWeese
> deweese@kodak.com
>                         "The only difference between theory and practice is
>                          that in theory there isn't any." -- unknown

