OpenExif SourceForge Project Page
OpenExif is an object-oriented library for accessing Exif formatted JPEG image files. The toolkits allows for creating, reading, and modifying the metadata in the Exif file. It also provides mean of getting and setting the main image and the thumbnail image.
What is Exif?
An Exif file is a JPEG image file with additional application segments which can contain tags with metadata (additional data of the image), a thumbnail, a screennail, audio data, etc.
For more information on Exif files, refer to the Exif specification.
Underlying Jpeg Toolkit
Web Site: www.ijg.org
Exif and related specs, sample images, forum, etc.
Picture Metadata Toolkit
The Picture Metadata Toolkit (PMT) provides a common object-oriented API to metadata associated with or stored in digital image files. PMT also allows metadata to be read or written in XML. Metadata definitions are expressed through XML Schema.
OpenTiff is an object-oriented interface to TIFF formated image files. Unlike other Tiff toolkits, it allows an arbitrary set of tags to be defined and used in a Tiff file.