Due to backward compatibility issues and the
closely-impossible-to-safely-use TIFFGetField(), we didn't manage to
agree on enabling the DNG 1.6 tags. Cf
https://gitlab.com/libtiff/libtiff/-/merge_requests/497 +
https://gitlab.com/libtiff/libtiff/-/merge_requests/528#note_1544237415
You could possibly get support for them by manually registering the tag
through the tag extension mechanism of TIFFMergeFieldInfo() (despite it
being documented as don't use it)
Edit: Oh... I see now your point in tiff 4.4.0, the tag was present as
TIFFTAG_CFAPATTERN, but during the DNG 1.6 update attempt during 4.5.1
development, it got moved elsewhere in the file and renamed
TIFFTAG_EP_CFA_PATTERN, and was thus subject to being disabled at last
minute before 4.5.1 release. So for that specific tag and
TIFFTAG_CFAREPEATPATTERNDIM, definitely an oversight. We should perhaps
re-enable it for 4.6.1 ... ?
Le 13/09/2023 à 21:07, Eike Gebauer a écrit :
Hi,
according to this comment
https://gitlab.com/libtiff/libtiff/-/blob/v4.6.0/libtiff/tif_dirinfo.c#L216
the currently missing DNG Tags were supposed to be part of libTIFF 4.6.
Currently I am unable to create TIFFs with TIFFTAG_EP_CFA_PATTERN
using the system libTIFF version on Archlinux that is built from
https://download.osgeo.org/libtiff/tiff-4.6.0.tar.gz.
Am I doing something wrong, is the remaining `#if 0` an oversight or
has the functionality regressed since libtiff 4.4 and I need to link
against an older version of the library?
Regards
Eike Gebauer
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