  The new widefield radio telescopes, such as: ASKAP,MWA, LOFAR, eVLA and SKA;
will produce spectral-imaging data-cubes (SIDC) of unprecedented volumes in the
order of hundreds of Petabytes. Servicing such data as images to the end-user
may encounter challenges unforeseen during the development of IVOA SIAP. We
discuss the requirements for extremely large SIDC, and in this light we analyse
the applicability of approach taken in the ISO/IEC 15444 (JPEG2000) standards.
