LibTiff Mailing List

Folks,

I've designed a new way to decode most of old-style JPEG compressed TIFF
files. Whilst this new decoder is currently part of my own TIFF codec,
which is substantially different from LibTiff, it is nevertheless my
intention to move it into LibTiff when I'm completely satisfied with it
and triple-checked it. That should lead to a tif_ojpeg.c with no LibJpeg
hack requirement, no complete single-chunk file buffer reader, no
security issues and buffer overflows and access violations, and better
quality output. Furthermore, since my OJPEG codec is designed to build a
good legit JPEG stream from the variously scattered bits and pieces of
OJPEG data in many of the mutually exclusive vendor specific
implementations, it would also serve in converters from OJPEG-in-TIFF to
JPEG, and to JPEG-in-TIFF.

I do need your help in two areas.

1) It is extremely important that I get as many testimages as possible,
from as many different sources as possible. I you've any old-style JPEG
compressed TIFFs laying about, please consider mailing me.

2) This all took considerable time already, and it's bound to eat more
of my time still. Unfortunately, I cannot afford to donate this time for
free. I would, if I could, but I can't. If you appreciate a new and
hugely improved tif_ojpeg.c, please consider putting some money where
your appreciation is, even if it's not a lot. In the unlikely event that
I do actually raise more money then this is worth, I will in turn pass
on all excess to Frank, Andrey, and Bob, so as to help fund other
development.

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


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive December 2005 Previous Thread Next Thread Previous by Thread Next by Thread Previous by Date Next by Date Contact The TIFF Mailing List Homepage This list is run by Frank Warmerdam Archive maintained by AWare Systems	Thread 2005.12.03 14:46 "Call for OJPEG test images", by Joris Van Damme 2005.12.03 15:16 "Re: Call for OJPEG test images", by Andrey Kiselev 2005.12.03 16:16 "Re: Call for OJPEG test images", by Joris Van Damme 2005.12.03 14:46 "Call for OJPEG test images", by Joris Van Damme Folks, I've designed a new way to decode most of old-style JPEG compressed TIFF files. Whilst this new decoder is currently part of my own TIFF codec, which is substantially different from LibTiff, it is nevertheless my intention to move it into LibTiff when I'm completely satisfied with it and triple-checked it. That should lead to a tif_ojpeg.c with no LibJpeg hack requirement, no complete single-chunk file buffer reader, no security issues and buffer overflows and access violations, and better quality output. Furthermore, since my OJPEG codec is designed to build a good legit JPEG stream from the variously scattered bits and pieces of OJPEG data in many of the mutually exclusive vendor specific implementations, it would also serve in converters from OJPEG-in-TIFF to JPEG, and to JPEG-in-TIFF. I do need your help in two areas. 1) It is extremely important that I get as many testimages as possible, from as many different sources as possible. I you've any old-style JPEG compressed TIFFs laying about, please consider mailing me. 2) This all took considerable time already, and it's bound to eat more of my time still. Unfortunately, I cannot afford to donate this time for free. I would, if I could, but I can't. If you appreciate a new and hugely improved tif_ojpeg.c, please consider putting some money where your appreciation is, even if it's not a lot. In the unlikely event that I do actually raise more money then this is worth, I will in turn pass on all excess to Frank, Andrey, and Bob, so as to help fund other development. 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

LibTiff Mailing List

Thread

2005.12.03 14:46 "Call for OJPEG test images", by Joris Van Damme