[Digikam-devel] [Bug 125779] use deflate compression for tiffs

[Gilles Caulier]

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http://bugs.kde.org/show_bug.cgi?id=125779         




------- Additional Comments From caulier.gilles free fr  2006-05-26 17:19 -------
Dennis,

My last fix in svn have really improved the compression result. Look below :

[gilles portable-gc METADATA]$ ls -l _dsc*
-rw-rw-r--  1 gilles gilles  1750127 fév 23 16:52 _dsc0034.jpg
-rw-------  1 gilles gilles 11704190 mai 26 17:12 _dsc0034.tif
-rw-------  1 gilles gilles 18205760 mai 26 17:10 _dsc0034.tiff

_dsc0034.jpg  is the original file in 8 bits color depth (JPEG)
_dsc0034.tif  is a 8 bits tiff file using deflate compression
_dsc0034.tiff is a 8 bits tiff file without compression.

The original image is here :

http://digikam3rdparty.free.fr/TEST_IMAGES/METADATA/_dsc0034.jpg

Here i'm using libtiff 3.6.1. I haven't tested with last libtiff available (3.8.2)

The difference with 16 bits color depth tiff image is less impressive. I don't know if it's a problem from libtiff.

I all case, i think you can compare now result with Gimp-svn.

Please give me a feedback.

Gilles