UnregisterCMMA function (icm.h)

Dissociates a specified ID value from a given color management module dynamic-link library (CMM DLL).


BOOL UnregisterCMMA(
  PCSTR pMachineName,



Reserved; must currently be set to NULL, until non-local registration is supported. This parameter is intended to point to the name of the computer on which a CMM DLLs registration should be removed. A NULL pointer indicates the local computer.


Specifies the ID value identifying the CMM whose registration is to be removed. This is the signature of the CMM registered with the International Color Consortium (ICC).

Return value

If this function succeeds, the return value is TRUE.

If this function fails, the return value is FALSE. For extended error information, call GetLastError.


If the profile for creating a transform later specifies this ID, the Windows default CMM will be used rather than this CMM DLL.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Header icm.h
Library Mscms.lib
DLL Mscms.dll

See also