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Important: The information in this document is obsolete and should not be used for new development.

Inside Macintosh: Advanced Color Imaging Reference /: Chapter 3 - ColorSync Manager Reference for Applications and Device Drivers / Constants and Data Types

Profile Reference
A profile reference is the means by which your application gains access to a profile. Several ColorSync Manager functions return a profile reference to your application. Your application then passes it as a parameter on subsequent calls to other ColorSync Manager functions that use profiles.
The ColorSync Manager returns a unique profile reference in response to each individual call to the CMOpenProfile (page 3-69), CMCopyProfile (page 3-76), and CMNewProfile (page 3-75) functions. This allows multiple applications concurrent access to a profile. The ColorSync Manager defines an abstract private data structure of type OpaqueCMProfileRef for the profile reference.
typedef struct OpaqueCMProfileRef *CMProfileRef;