[Digikam-devel] [Bug 130798] New: digikam editor saves some jpeg's 30% smaller than original - even with jpeg compression option set at 100
jwest at melaque.com
Fri Jul 14 03:54:25 BST 2006
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Summary: digikam editor saves some jpeg's 30% smaller than
original - even with jpeg compression option set at 100
AssignedTo: digikam-devel kde org
ReportedBy: jwest melaque com
Version: 0.9.0-svn (using KDE 3.5.3, Debian Package 4:3.5.3-1 (testing/unstable))
Compiler: Target: i486-linux-gnu
OS: Linux (i686) release 2.6.15-1-686-smp
If you open a jpeg in Digikam Image Editor, make no changes, and than save
to a different file name, the resultant jpeg is ~30% smaller than the original.
original test image (~6.2M) :
as saved by Digikam (~4.8M) :
I do have the settings option for jpeg compression set at 100.
This is unfortunate for those with shinny-new-high-megapixel-cameras.
I would have not thought that the image would be compressed. As a test
I mailed the image to a friend with some-photo-ms-thingie, and he reports
that saving the photo with no changes results in an ~6M file. I read somewhere
that libjpeg will set a 'default' horizontal and vertical sampling factor if
they are not set, but I have not found the spot in the Digicam code
where that might be used.
Thanks for considering this...
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