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<title>Extra Tags</title>
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<h2 class=top>Extra Tags</h2>
<p>
The extra tags represent extra information extracted or generated by
ExifTool that is not directly associated with another tag group. The three
writable "pseudo" tags (FileName, Directory and FileModifyDate) may be
written without the need to rewrite the file since their values are not
contained within the file data. These "pseudo" tags belong to the family 1
"System" group.
</p>
<blockquote>
<table class=frame><tr><td>
<table class=inner cellspacing=1>
<tr class=h><th>Tag Name</th>
<th>Writable</th><th>Values / <span class=n>Notes</span></th></tr>
<tr>
<td>CanonVRD</td>
<td class=c>Y!</td>
<td><span class=s><span class=n>(the full Canon DPP VRD trailer block)</span></span></td></tr>
<tr class=b>
<td>Comment</td>
<td class=c>Y</td>
<td><span class=s><span class=n>(comment embedded in JPEG, GIF89a or PPM/PGM/PBM image)</span></span></td></tr>
<tr>
<td>CurrentIPTCDigest</td>
<td class=c>N</td>
<td><span class=s><span class=n>(MD5 digest of IPTC data. All zeros if IPTC exists but Digest::MD5 is not
installed)</span></span></td></tr>
<tr class=b>
<td>Directory</td>
<td class=c>Y!</td>
<td> </td></tr>
<tr>
<td>EXIF</td>
<td class=c>Y!</td>
<td><span class=s><span class=n>(the full EXIF data block from JPEG, PNG, JP2, MIE and MIFF images)</span></span></td></tr>
<tr class=b>
<td>Encryption</td>
<td class=c>N</td>
<td> </td></tr>
<tr>
<td>Error</td>
<td class=c>N</td>
<td> </td></tr>
<tr class=b>
<td>ExifByteOrder</td>
<td class=c>Y</td>
<td><span class=s><span class=n>(only writable for newly created EXIF segments)</span>
<br>'II' = Little-endian (Intel, II)
<br>'MM' = Big-endian (Motorola, MM)</span></td></tr>
<tr>
<td>ExifToolVersion</td>
<td class=c>N</td>
<td> </td></tr>
<tr class=b>
<td>ExifUnicodeByteOrder</td>
<td class=c>Y</td>
<td><span class=s><span class=n>(the EXIF specification is particularly vague about the byte ordering for
Unicode text, and different applications use different conventions. By
default ExifTool writes Unicode text in EXIF byte order, but this write-only
tag may be used to force a specific byte order)</span>
<br>'II' = Little-endian (Intel, II)
<br>'MM' = Big-endian (Motorola, MM)</span></td></tr>
<tr>
<td>FileModifyDate</td>
<td class=c>Y!</td>
<td><span class=s><span class=n>(the filesystem modification time)</span></span></td></tr>
<tr class=b>
<td>FileName</td>
<td class=c>Y!</td>
<td><span class=s><span class=n>(may be written with a full path name to set FileName and Directory in one
operation)</span></span></td></tr>
<tr>
<td>FileSize</td>
<td class=c>N</td>
<td> </td></tr>
<tr class=b>
<td>FileType</td>
<td class=c>N</td>
<td> </td></tr>
<tr>
<td>GIFVersion</td>
<td class=c>N</td>
<td> </td></tr>
<tr class=b>
<td>Geosync</td>
<td class=c>Y</td>
<td><span class=s><span class=n>(this write-only tag specifies a time difference to add to Geotime for
synchronization with the GPS clock. For example, set this to "-12" if the
camera clock is 12 seconds faster than GPS time. Input format is
"[+-][[[DD ]HH:]MM:]SS[.ss]". Must be set before Geotime to be effective)</span></span></td></tr>
<tr>
<td>Geotag</td>
<td class=c>Y</td>
<td><span class=s><span class=n>(this write-only tag is used to define the GPS track log data or track log
file name. Currently supported track log formats are GPX, NMEA RMC/GGA/GLL,
KML, IGC, Garmin XML and TCX, and Magellan PMGNTRK)</span></span></td></tr>
<tr class=b>
<td>Geotime</td>
<td class=c>Y</td>
<td><span class=s><span class=n>(this write-only tag is used to define a date/time for interpolating a
position in the GPS track specified by the Geotag tag. Writing this tag
causes the following 8 tags to be written: GPSLatitude, GPSLatitudeRef,
GPSLongitude, GPSLongitudeRef, GPSAltitude, GPSAltitudeRef, GPSDateStamp and
GPSTimeStamp. The local system timezone is assumed if the date/time value
does not contain a timezone. May be deleted to delete associated GPS tags.
A group name of 'EXIF' or 'XMP' may be specified to write or delete only
EXIF or XMP GPS tags. The value of Geotag must be assigned before this tag)</span></span></td></tr>
<tr>
<td>ICC_Profile</td>
<td class=c>Y!</td>
<td><span class=s><span class=n>(the full ICC_Profile data block)</span></span></td></tr>
<tr class=b>
<td>ID3Size</td>
<td class=c>N</td>
<td> </td></tr>
<tr>
<td>ImageHeight</td>
<td class=c>N</td>
<td> </td></tr>
<tr class=b>
<td>ImageWidth</td>
<td class=c>N</td>
<td> </td></tr>
<tr>
<td>JPEGDigest</td>
<td class=c>N</td>
<td><span class=s><span class=n>(an MD5 digest of the JPEG quantization tables is combined with the component
sub-sampling values to generate the value of this tag. The result is
compared to known values in an attempt to deduce the originating software
based only on the JPEG image data. For performance reasons, this tag is
calculated only if specifically requested)</span></span></td></tr>
<tr class=b>
<td>MIMEType</td>
<td class=c>N</td>
<td> </td></tr>
<tr>
<td>MaxVal</td>
<td class=c>N</td>
<td> </td></tr>
<tr class=b>
<td>Now</td>
<td class=c>N</td>
<td><span class=s><span class=n>(used to set the value of a tag to the current date/time. Not generated unless
specified)</span></span></td></tr>
<tr>
<td>PreviewImage</td>
<td class=c>Y</td>
<td> </td></tr>
<tr class=b>
<td>RAFVersion</td>
<td class=c>N</td>
<td> </td></tr>
<tr>
<td>Warning</td>
<td class=c>N</td>
<td> </td></tr>
<tr class=b>
<td>XMP</td>
<td class=c>Y!</td>
<td><span class=s><span class=n>(the full XMP data block)</span></span></td></tr>
<tr>
<td>XResolution</td>
<td class=c>N</td>
<td> </td></tr>
<tr class=b>
<td>YResolution</td>
<td class=c>N</td>
<td> </td></tr>
</table></td></tr></table></blockquote>
<hr>
(This document generated automatically by Image::ExifTool::BuildTagLookup)
<br><i>Last revised Oct 28, 2009</i>
<p class=lf><a href='index.html'><-- ExifTool Tag Names</a></p>
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