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<?xml version="1.0" encoding="utf-8"?>
<section id="GuideReferenceMetadata">
<title id="titleGuideReferenceMetadata">Metadata Processing</title>
<para>This section describes the metadata reading and writing process.</para>
<para />
<section id="Metadatahandling">
<title>Metadata handling</title>
<para />
<section id="Readalgorithm">
<title>Read algorithm</title>
<orderedlist spacing="compact">
<listitem>
<para>Read Exif, IPTC and XMP from the file.</para>
</listitem>
<listitem>
<para>
Display this "raw" data in the
<link linkend="GuideOtherWindowsExif">Exif Window</link>
.
</para>
</listitem>
<listitem>
<para>Read XMP sidecar or Geeqie private metadata file. This data will override the XMP data read from the file.</para>
</listitem>
<listitem>
<para>
Synchronise XMP data with Exif and IPTC data. This process corresponds to the section "Reconciling metadata properties" as described in the
<link linkend="GuideReferenceStandards">XMP Specification</link>
.
<itemizedlist spacing="compact">
<listitem>
<para>detect which of Exif and Xmp.exif is newer and copy the data in the appropriate direction</para>
</listitem>
<listitem>
<para>detect which of IPTC and XMP is newer and copy the data in the appropriate direction</para>
</listitem>
</itemizedlist>
</para>
</listitem>
<listitem>
<para>
Use this "processed" data within Geeqie, with the exception of in the
<link linkend="GuideOtherWindowsExif">Exif Window</link>
</para>
</listitem>
</orderedlist>
<para />
</section>
<section id="Metadatamodification">
<title>Metadata modification</title>
<itemizedlist spacing="compact">
<listitem>
<para>
Metadata is written to a single file or group of files as specified in the
<link linkend="MetadataMiscellaneous">Metadata</link>
tab of main Preferences.
</para>
</listitem>
<listitem>
<para>Modifying the keywords, comment, orientation, etc. does not ask for confirmation, but immediately modifies the metadata in memory and adds the file to "write queue"</para>
</listitem>
<listitem>
<para>
Writing of the queued changes is triggered either
<link linkend="Buttons">manually</link>
or as defined in
<link linkend="GuideOptionsMetadata" endterm="titleGuideOptionsMetadata" />. It is possible to review the changes and exclude selected files.
</para>
</listitem>
</itemizedlist>
<para />
</section>
<section id="Writealgorithm">
<title>Write algorithm</title>
<orderedlist spacing="compact">
<listitem>
<para>
Exif and IPTC are updated from XMP (for example
<emphasis>Exif.Image.Orientation</emphasis>
is updated from
<emphasis>Xmp.exif.orientation</emphasis>
). See
<link linkend="GuideReferenceStandards">XMP</link>
and
<link linkend="GuideReferenceStandards">IPTC4XMP</link>
specifications for the list of corresponding tags.
</para>
</listitem>
<listitem>
<para>
Try to write metadata in the order specified in the
<link linkend="MetadataWritingProcess" endterm="titleMetadataWritingProcess" />
section of Preferences.
</para>
</listitem>
<listitem>
<para>After the first successful write attempt delete old metadata files in all possible locations.</para>
</listitem>
</orderedlist>
<para />
</section>
</section>
<section id="Optionsthatinfluencestheprocess">
<title>Options that influence the process</title>
<para>
File types with allowed sidecars are listed in the
<link linkend="GuideOptionsFiltering" endterm="titleGuideOptionsFiltering" />
tab of the main Preferences.
</para>
<para />
</section>
</section>
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