[Digikam-devel] Fwd: [exiv2] Re: TIFF write support in SVN trunk - status update

[Gilles Caulier]

Hi all,

I forward this message written by Andreas from Exiv2 mailing list.

This is want mean than RAW metadata writting mode start to work.
Andreas need feedback to improve it. Please send you report to Exiv2
mailing list.

Thanks in advance

Gilles Caulier


---------- Forwarded message ----------
From: Andreas Huggel <ahuggel at gmx.net>
Date: 2008/8/18
Subject: [exiv2] Re: TIFF write support in SVN trunk - status update
To: exiv2 at yahoogroups.co.uk


After some more tweaking, exiv2 can by now successfully write to
standard TIFF, TIFF/EP, DNG, NEF and PEF images. SR2 works almost
(parts of the makernote are lost) while writing to ARW images will
still corrupt the picture.

"Writing to the image successfully" means that after modifying or
adding any metadata, incl IPTC and XMP, the image structure as
reported by exifprobe is intact and it is possible to view the image
using ufraw or digiKam without any new errors or warnings.

However, I have no proprietary RAW viewer software to test with and
only a very limited number of sample images for these TIFF-like RAW
formats.

So please go ahead and do your own tests and report your successes and
problems here.

Andreas

Technicalities:
1) The mapping of image metadata to Exiv2 keys and values has changed
slightly (was simplified): In certain cases (e.g., NEF, DNG), Exiv2
used to map metadata from sub-IFDs to Exif.Image.* tags. Now it
extracts all tags without any mapping; sub-IFD tags are listed as
Exif.SubImage[1-4].*
2) The image data of preview images is not loaded from the file
(similar to the main image, which is also not loaded). Therefore they
can't be accessed through the Exiv2 API for now (unlike thumbnails and
Nikon and Pentax previews embedded in the Makernote). This can be
added later.

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