International Standard ISO/IEC 18025
This document is ISO/IEC 18025, the Environmental Data Coding Specification (EDCS). The full title of this International Standard is: Information technology — Computer graphics and image processing — Environmental Data Coding Specification (EDCS).
http://www.iso.ch/iso/en/ittf/PubliclyAvailableStandards/ISO_IEC_18025_Ed1.html