For device-independent color reproduction, it is necessary to accurately characterize each individual color input and output device and transform image **data** into appropriate devicedependent versions based on the characterization. In order to isolate the end user from the nitty-gritty of handling color characterization information and transformations, color management systems have been proposed to automate this task. For a discussion of the systems issues in color management and existing color management schemes, the reader is referred to recent presentations on the topic [334]- [336]. A notable advance in this direction is the emergence of a widely accepted standard [86], [337] to facilitate the communication of device characterizations.