[Digikam-devel] [Bug 130798] New: digikam editor saves some jpeg's 30% smaller than original - even with jpeg compression option set at 100

[J.Westveer]

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http://bugs.kde.org/show_bug.cgi?id=130798         
           Summary: digikam editor saves some jpeg's 30% smaller than
                    original  - even with jpeg compression option set at 100
           Product: digikam
           Version: 0.9.0-svn
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        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) :
 http://www.melaque.com/tree.jpg

as saved by Digikam (~4.8M) :
 http://www.melaque.com/tree-digikam.jpg

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...