2000.02.03 16:24 "Re: Microsoft Imaging and Jpeg in TIFF", by Joris Van Damme

I use to make Wang JPEG images the freely available "Wang Imaging for Windows 95."

Yeah, I wasn't aware of it. Of course I have that fancy wang thing. Thank you for pointing that out.

Could you send me your sample TIFF/J image? I would see how it is. Thank you.

The only jpeg embedding tiff I've found is (or was?) part of the official testpics collection, it is (or was) called quad-jpeg. It's a good image, JPEG not OJPEG. I had some problems with it in the beginning, but it turns out the libtiff/libjpeg combination is perfectly able to read it *IF* you instruct libjpeg to ouput RGB instead of YCbCr through the appropriate TIFF pseudo-tag. Otherwise, it gets as bad as an access violation (but maybe I've made some bad changes or something, it could be MY problem and not a libtiff/libjpeg problem).

Anyway, I'll mail it to your private account.

As for the problem here, OJPEG images that in fact are not OJPEG as they should be... either we find a way to recognize them and decode them (both!) with 100% certainty; or either we give up on OJPEG, that will exclude these troublesome images too. At this point, I think I'll go for that second option.

Joris