[Digikam-devel] [Bug 191494] Wish: search offline collections (e.g. removable medias)

[Gilles Caulier]

https://bugs.kde.org/show_bug.cgi?id=191494





--- Comment #16 from Gilles Caulier <caulier gilles gmail com>  2009-05-29 11:01:46 ---
Created an attachment (id=34097)
 --> (http://bugs.kde.org/attachment.cgi?id=34097)
PGF compression tests

Some test results with PGF format using pgf command line tool:

* Original image:

-rwxr-xr-x 1 gilles gilles 17485555 2008-12-29 10:49 pict1999.png

* Original converted to PGF with wavelets lossless compression :
-rw-r--r-- 1 gilles gilles 13806596 2009-05-29 10:26 pict1999.pgf
Encoding time (encoding, writing PGF): 4.25 s
Total time (reading source, conversion, writing destination): 6.2 s
Compression ratio: 1.26646

* Original converted to PGF with wavelets compression level 10 (no visible
artifacts):
-rw-r--r-- 1 gilles gilles   949812 2009-05-29 10:51 pict1999-q10.pgf
Encoding time (encoding, writing PGF): 0.93 s
Total time (reading source, conversion, writing destination): 2.94 s
Compression ratio: 18.4095

* Thumbnail 256x256:
-rw-r--r-- 1 gilles gilles   366042 2009-05-29 10:28 pict1999-256.png

* Thumbnail converted to PGF with wavelets lossless compression :
-rw-r--r-- 1 gilles gilles   106942 2009-05-29 10:28 pict1999-256.pgf
Encoding time (encoding, writing PGF): 0.13 s
Total time (reading source, conversion, writing destination): 0.21 s
Compression ratio: 3.42281

* Thumbnail converted to PGF with wavelets compression level 10 (no visible
artifacts):

-rw-r--r-- 1 gilles gilles    22682 2009-05-29 10:45 pict1999-256-q10.pgf
Encoding time (encoding, writing PGF): 0.05 s
Total time (reading source, conversion, writing destination): 0.13 s
Compression ratio: 16.138

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