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37 lines
1.2 KiB
HTML
37 lines
1.2 KiB
HTML
__doctype__
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<html>
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__header2__
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<body>
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<div id="content">
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__index1__
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__index3__
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<h2>Canon CRW files: Mapping of CIFF to Exif tags</h2>
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<div>
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<p> CRW files are encoded in CIFF format. CIFF format consists of a
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header and a hierarchy of directories and entries, similar to TIFF
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(but easier to deal with). In Exiv2, there is no CRW or CIFF type of
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metadata. Instead, known and suitable CIFF tags are mapped to Exif
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metadata, but not all CIFF tags are mapped. Exiv2 reads Canon CRW
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files, parses the CIFF structure and maps known and suitable tags to
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Exif metadata. Writing to CRW files entails a reverse mapping from
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Exif metadata to the CIFF tags. This way it is possible, e.g., to
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adjust the date when the image was taken by reading the CRW file,
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modifying Exif.Photo.DateTimeOriginal and writing the Exif data back
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to a CRW file. Tags for which there is no mapping defined are ignored
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during both, reading and writing.</p>
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<p>Reference: <a href="http://www.sno.phy.queensu.ca/~phil/exiftool/canon_raw.html">The Canon RAW (CRW) File Format</a> by Phil Harvey.</p>
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<p>Exiv2 supports the mappings listed in the table below.</p>
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<p>Click on a column header to sort the table.</p>
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</div>
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__CrwMapping__
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</div>
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<!-- closes content -->
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</body>
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</html>
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