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Date Posted: 10:11:44 05/20/04 Thu
Author: glup
Subject: wishlist for extended tiff support

Please include some more features of libtiff:

1. Write and read support for sub-ifds (TIFFSetSubDirectory and SubIFD tag; for write support see tools/thumbnail.c); if you have a REALLY big highres image having an included handy thumbnail is performance wise very reasonable!

2. Write support for alpha-channel (isn't there native windows alpha channel support?).

3. Support for writing strip or tile oriented images

4. Support of libtiffs meaning of private tags (see contrib/tags) by exposing an event compatible to TIFFSetTagExtender. I suggest to remove SetTiffTagValues...
I want to use GeoTiff, EXIF and GPS tags... EXIF and GPS using "private" IFDs that could be accessed with libtiff as a SubIFD (setting the offset stored in a tag of a "root" IFD; <a rel=nofollow target=_blank href="http://www.exif.org/Exif2-2.PDF">http://www.exif.org/Exif2-2.PDF</a> Section 4.6.3).

5. Just in case it is not done allready: enable ALL non-experimental libtiff options:
// from <a rel=nofollow target=_blank href="http://www.libtiff.org/internals.html):">http://www.libtiff.org/internals.html):</a>
COMPRESSION_SUPPORT
CCITT_SUPPORT
PACKBITS_SUPPORT
LZW_SUPPORT // !!!!!
THUNDER_SUPPORT
NEXT_SUPPORT
OJPEG_SUPPORT
JPEG_SUPPORT
PIXARLOG_SUPPORT
SGILOG_SUPPORT
COLORIMETRY_SUPPORT
YCBCR_SUPPORT
CMYK_SUPPORT
ICC_SUPPORT
// following from include/tiffconf.h
SUBIFD_SUPPORT // !!!!
PHOTOSHOP_SUPPORT // !!!!
IPTC_SUPPORT
LOGLUV_SUPPORT

6. Access to embedded ICC profiles (just a stream would be sufficent; <a rel=nofollow target=_blank href="http://www.color.org/ICC1-V41_ForPublicReview.pdf">http://www.color.org/ICC1-V41_ForPublicReview.pdf</a> Annex B.3)

7. fax2tiff (I had written a posting for that... I belive it requires the exposure of the libtiff internal struct tiff)

8. Support a warning handler (TIFFSetWarningHandler).

9. Support (read and write) of color sepearted images (PlanarConfiguration = 2)

10. Extracting of parts of tiled images without loading the complete image into memory, e.g. by using TIFFReadTile with appropirate x, y, z and sample.

rgds

:-glup

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