Identifies a color profile group of the requested color profile.

Values:

IG_CP_GRP_WORKING	WCP (Working Color Profile). This group of color profiles provides information about the default color global parameters used to represent the color data for HIGEAR objects. Those global parameters are used if the image does not have a local color profile associated with it.
IG_CP_GRP_IMPORT	ICP (Import Color Profile). This group of profiles is used during a filter load operation.
IG_CP_GRP_EXPORT	ECP (Export Color Profile). This group of profiles is very similar to ICP but is used in the filter export operation.