Library Features:

+ rename erase* methods that access a file to remove* 

+ add ExifData::erase(tag)

+ Thumbnail support: set (re-calculate)

+ operator>> for Value, since we already have read()?

+ Use size_t where appropriate

+ Support TIFF type ids

+ Support for broken IFD makernotes (which have corrupted IFD offsets)

+ Support non-intrusive deletion of entries from an IFD.

+ Write an example using low level IFD classes to print summary Exif info

+ Extended JPEG support (actual resolution of the image)

+ Implement proper error handling

+ Complete support to create Exif data from scratch:

  + set thumbnail, write thumbnail tags

+ Make it possible to force write from metadata (just an optional arg to write?)

+ Make Image::doWriteMetadata do its work in a single pass

+ Revise Image and IptcData+ExifData API (aka turn it inside out)

+ Add PSD images support (and TIFF, NEF, CRW...)

+ Add support for XML metadata files

Exiv2 functionality

+ Add offset to value for hexdump (requires metadata to have an offset)

Bugs:

+ Handle all Todo's

+ Cleanup and fix implementation of JpegImage (must be able to read any APP0/1),

  should be able to insert exv into extracted thumbs (usually w/o APP0/1)

+ Review Image interface. Is it really necessary to have so many functions there?

+ Review the handling of type ids? What if we encounter type 27 in an IFD?

+ Rational and other output operators (see Josuttis, p653)

+ Through ExifData::iterator and Metadatum::operator= it is possible to have 

  multiple copies of one metadatum in the metadata container

+ Checks and non-intrusive updates must be atomic, i.e., not change anything

  if the metadata is not compatible

+ Review: Exception safety

+ Review: Ifd1 only at Thumbnail, do we really need Thumbnail::update() ?

+ Should JpegImage differ between NO Jpeg comment and an empty Jpeg comment??