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February 2007

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2007.02.05 03:28 "Request help On OJPEG Compression In Libtiff", by Steven Lim
2007.02.05 18:19 "Re: Request help On OJPEG Compression In Libtiff", by Chris Cox
2007.02.05 19:08 "Re: Request help On OJPEG Compression In Libtiff", by Joris Van Damme
2007.02.05 19:14 "Re: Request help On OJPEG Compression In Libtiff", by Chris Cox
2007.02.05 19:29 "Re: Request help On OJPEG Compression In Libtiff", by Joris Van Damme
2007.02.05 18:49 "Re: Request help On OJPEG Compression In Libtiff", by Joris Van Damme

2007.02.05 19:08 "Re: Request help On OJPEG Compression In Libtiff", by Joris Van Damme

Chris,

Chris Cox wrote:
> 2) REALLY, don't do that  -- the old JPEG encoding is rarely
> supported (I'm sorely tempted to add a more severe note to Photoshop
> when encountering them to say that the file is buggy and the user
> needs to complain to the vendor that wrote it).

Hate to spoil your fantasy, but Windows XP and apparently Vista standard 
previewing of images supports nothing but OJPEG. Same goes for Microsoft 
Document Imaging stuff, or so I'm told. Another vendor that produces nothing 
but OJPEG, is Kofax, which apparently is no small fish either.

Apparently, many people have a need to be compatible with these products, in 
that they need to write files that these products can read fine. Actually, 
my own customers wanted me to add OJPEG writing support to my own codec for 
exactly this reason, and after much consideration I had to give in to these 
needs, as I do understand them even if I very much dislike the situation and 
the bad original OJPEG specification.

We seem to be trying to dry the kitchen floor, but we forgot to close the 
water tap first. Perhaps a more severe note in Photoshop could get some 
people's attention, but then again, I guess it's not very likely the issue 
didn't get their attention before. People have been screaming about this 
issue for about two decades now.

Furthermore, the message in Photoshop might look a bit silly, given the fact 
that Adobe has neglected to update the spec sofar. Any lock-in strategy from 
an OJPEG vendor, can be backed up by a pointer to the current TIFF 
specification. We might know there's supplements, but there's no reason why 
anyone else should know, and the web is full of pointers directly to the 
TIFF 6.0 spec PDF that bears no indication of the existence of supplements 
that override it.


Best regards,

Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be/
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