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Library Features:
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+ rename erase* methods that access a file to remove*
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+ add ExifData::erase(tag)
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+ Thumbnail support: set (re-calculate)
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+ operator>> for Value, since we already have read()?
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+ Use auto_ptr and DataBuf where applicable
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+ Use size_t where appropriate
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+ Support TIFF type ids
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+ Support for broken IFD makernotes (which have corrupted IFD offsets)
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+ Support TIFF images (TiffImage)
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+ Support non-intrusive deletion of entries from an IFD.
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+ Extended JPEG support (comments, actual resolution of the image)
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+ Write an example using low level IFD classes to print summary Exif info
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+ Implement proper error handling
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+ Complete support to create Exif data from scratch:
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+ set thumbnail, write thumbnail tags
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+ Make it possible to force write from metadata (just an optional arg to write?)
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+ Get rid of Image::detach and make Image open files on-demand
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+ Make Image::doWriteMetadata do its work in a single pass
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+ Make sure IptcData supports unknown dataset (with Key class that handles Ids)
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+ Revise Image and IptcData+ExifData API (aka turn it inside out)
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+ Add PSD images support (and TIFF, NEF, CRW...)
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+ Add support for XML metadata files
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Exiv2 functionality
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+ Add offset to value for hexdump (requires metadata to have an offset)
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Bugs:
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+ Handle all Todo's
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+ Cleanup and fix implementation of JpegImage (must be able to read any APP0/1),
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should be able to insert exv into extracted thumbs (usually w/o APP0/1)
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+ Review Image interface. Is it really necessary to have so many functions there?
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+ Review the handling of type ids? What if we encounter type 27 in an IFD?
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+ Rational and other output operators (see Josuttis, p653)
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+ Through ExifData::iterator and Metadatum::operator= it is possible to have
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multiple copies of one metadatum in the metadata container
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+ Checks and non-intrusive updates must be atomic, i.e., not change anything
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if the metadata is not compatible
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+ Review: Exception safety
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+ Review: Ifd1 only at Thumbnail, do we really need Thumbnail::update() ?
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+ Is the hexdump output of exiv2 byte-swapped??
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+ Should JpegImage differ between NO Jpeg comment and an empty Jpeg comment??
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