21. A computer-readable medium carrying one or more sequences of one or more instructions for selectively generating a display of a region of an image from a description of the image, the one or more sequences of one or more instructions including instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of: receiving a request from a client for at least part of said image; in response to receiving said request, performing the steps of: (A) determining a field of view of said client relative to said image; (B) selecting a portion of said description based on said field of view; (C) generating a source text based on the portion of said description that was selected based on said field of view; and (D) delivering the source text to the client.
21. A computer-readable medium carrying one or more sequences of one or more instructions for selectively generating a display of a region of an image from a description of the image, the one or more sequences of one or more instructions including instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of: receiving a request from a client for at least part of said image; in response to receiving said request, performing the steps of: (A) determining a field of view of said client relative to said image; (B) selecting a portion of said description based on said field of view; (C) generating a source text based on the portion of said description that was selected based on said field of view; and (D) delivering the source text to the client. 22. The computer-readable medium recited in claim 21, wherein said description is stored in a database in association with information that identifies regions of said image.