2017.04.28 20:38 "[Tiff] Interesting change/problem in LibTiff 4.0.7 with unsupported compressions", by

2017.05.02 14:33 "Re: [Tiff] Interesting change/problem in LibTiff 4.0.7 with unsupported compressions", by Charles Auer

In the meantime, if you need to explore tags, AsTiffTagViewer is a free TIFF Tag Viewer application for Windows.

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http://www.awaresystems.be/imaging/tiff/astifftagviewer.html

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Charles

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AsTiffTagViewer - AWare Systems<http://www.awaresystems.be/imaging/tiff/astifftagviewer.html>

www.awaresystems.be

AsTiffTagViewer, a freeware TIFF Tag Viewer for Windows, download page

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From: tiff-bounces@lists.maptools.org <tiff-bounces@lists.maptools.org> on behalf of Michael Shiels [ MaS Software Inc ] <MaSSoft@massoftware.com>

Just wondering if anyone has thoughts on this problem. Once I posted it seem to have made it into the archive which means maybe it get through at all?? doesn’t’ didn’t

This is a interesting situation since most people expect an error just from enumerating the directory and reading the tags. Maybe a warning would be more appropriate specifically for an inability to detail out the compression specific tags maybe?? don’t

Thanks.

Mike

From: tiff-bounces@lists.maptools.org [mailto:tiff-bounces@lists.maptools.org] On Behalf Of Michael | Shiels [ MaS \ Software \ Inc ]

Sent: Friday, April 28, 2017 4:38 PM
To: tiff@lists.maptools.org

Subject: [Tiff] Interesting change/problem in LibTiff 4.0.7 with unsupported compressions

I found a decent change in the behavior of Libtiff after I updated from –

Specifically this piece of code – basically ends up tripping an error if the compression is not compiled/activated in the code. So you can’t even peruse/move through a file without tripping an error.

/*

* An opportunity for compression mode dependent tag fixup

*/

(*tif->tif_fixuptags)(tif);

Our engine specifically watches for errors and assumes it’s pretty fatal – when really it’s kinda benign – UNLESS I want to extract the image data itself, right??

Surely that should be pretty benign to just enumerate through a TIFF – even if you don’t support the compression of each page??

Mike