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June 2006

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2006.06.09 19:35 "Way to write Exif tags using libtiff 3.8.2", by Caulier Gilles

Hi all,

I'm the main developper of digiKam, an open-source GUI applications to
manage photograph under linux (http://www.digikam.org)

In digiKam, we have a pictures editor and an interface to extract Exif/Iptc 
metadata from RAW, JPEG, PNG, and TIFF files format (16 bits color depth 
supported).

I'm currently trying to finalize a TIFF codec to write a tiff file with 
metadata support. All work fine excepted the EXIF tags using libtiff 3.8.2.

My current TIFF codec source code is here :

http://websvn.kde.org/trunk/extragear/graphics/digikam/libs/dimg/loaders/tiffloader.cpp?rev=547372&view=auto

I'm sure that my implementation about Exif tags recording is wrong in  
TIFFLoader::save() method. Duing a big difficulty to found substancial 
informations (source code examples in fact) about Exif tags support and 
libtiff, I'm trying this mailing (:=)))...

Please, let's me hear what is wrong in my implementation. Thanks in advance 
for your help and your comments.

Best Regards

Gilles Caulier