Nitpicking, the * in the docblocks for the method, are not indented properly.
Minor (but important) things to attend to prior to first release (mostly package.xml related):
Regarding package version, the first release should not be marked as stable, 1.0.0. See RFC http://pear.php.net/pepr/pepr-proposal-show.php?id=65
The proper folder name for baseinstalldir should be "Image" and not "image".
Fix the dependency of package name to JPEG XML Reader package.
Add a dependency on SimpleXML extension.