2002.09.13 21:13 "Re: TIFF G4 decompression problems", by Joel Schumacher

Hmmm.... All blank at the end? G4 has a keyword that says, "the rest of the page is blank white space". It's an End-Of-Facsimile-Block. (EOFB)

I no longer use the libtiff utilities since I got the project working, so this may be fixed, but at the time libtiff had a bug, as did our OCR software. Neither recognizes this keyword and blew up when it encountered the EOFB. So if two implementations had the same bug, maybe others do too.

Paint Shop Pro read the images just fine though.

Everyone at the OCR company insisted my images were corrupt, which didn't make sense if PSP could read them. After having the OCR company act authoritarian about it (we know TIFF, how dare you suggest we have a bug?), I discovered that all the "corrupt" images were using this EOFB codeword. Something they didn't know about. After presenting the pages from the TIFF documentation showing it was perfectly valid, they fixed the product.

I also brought it up to this list and I thought somebody was looking at it. But several months later, somebody was reporting a similar problem and at that time it was discovered it was still not fixed. But I thought somebody was going to take care of it.

Is it possible that libtiff is still broken? Is it possible that (being these were created with libtiff) that somebody coded the EOFB into the encode, but not into the decode?

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Joel Schumacher                    JCPenney Co. - UNIX Network Systems
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