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Article #579

Re: Way to get rid of HSI header in JPEGs

#579
From: Tom Lane
Date: Tue, 15 Dec 1992 16:08
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briana@tau-ceti.isc-br.com (Brian W. Antoine) writes:
> : >>cvance@polaris.unm.edu (Chad Vance) writes:
> : >>| Plese let me know if there is a way to get rid of the Handmade Software
> : >>| header bullshit!
> : 
>   I had pretty good luck just deleting the first 332 chars of the file.  That
> removed the HSI header and the remainder was a normal Jpeg file.  Of course
> the image in question was a repost from a few months ago, so I did it more to
> see if it could be done than anything else.

This may work once in a while, but it fails on most HSI files.  In a typical
HSI file, only portions of the image are encoded in JPEG format.  Extracting
out the part(s) that look like JPEG datastreams does not give you a complete
or even internally consistent image.

In my opinion, HSI has single-handedly done more to confuse the JPEG file
format situation than anyone else.  Proprietary file formats are not a good
thing.

			regards, tom lane
			organizer, Independent JPEG Group
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Message-ID: <BzB66E.4qM.1@cs.cmu.edu>
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References: <1992Dec14.220241.7337@murdoch.acc.Virginia.EDU> <2902@tau-ceti.isc-br.com>

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From: tgl+@cs.cmu.edu (Tom Lane)
Subject: Re: Way to get rid of HSI header in JPEGs
Message-ID: <BzB66E.4qM.1@cs.cmu.edu>
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References: <1992Dec14.220241.7337@murdoch.acc.Virginia.EDU> <2902@tau-ceti.isc-br.com>
Date: Tue, 15 Dec 1992 16:08:30 GMT
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