[Digikam-devel] [Bug 183171] New: Decode and encode metadata once only

Andreas Huggel ahuggel at gmx.net
Wed Feb 4 13:52:30 CET 2009


           Summary: Decode and encode metadata once only
           Product: digikam
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: unspecified
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: ahuggel at gmx.net

Version:            (using Devel)
Installed from:    Compiled sources

In the current design, metadata is decoded from the binary form in the image to
an Exiv2 metadata container when an image is loaded. Immediately after this,
the metadata is encoded again (for JPEG) and is internally stored in a binary

Since decoding and encoding of metadata is an expensive operation and is
potentially lossy, the proposed design is that image metadata is decoded only
once - when the image is loaded - and encoded only when the image is written.
Internally digiKam should keep the decoded metadata in a container (which it
doesn't copy).

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