In this paper we present how JPEG2000 system architecture structure can be accessed via the network using web services and dynamically created web pages. With our approach we are capable of creating an on demand service to extract and insert metadata in .JP2 image files and, using classes even not tuned for this application, we can compute and extract features from images based on wavelet decomposition in order to made them available for reinsertion as metadata. The web service interface can serve both as a foundation for web interfaces and as an API of its own.