This demo uses the ExifReader JS library by Mattias Wallander who has done a tremendous job of figuring out how to read embedded data through the FileReader API. Please note that the ExifReader.js file used in this demo was taken from the iptc branch, and will not work with the released version.
To get started simply choose a file and hit the upload button. Nothing is posted; instead the file is processed in the browser and the extracted metadata will appear below the form.