Techwiki:Win32k/COLOROBJECT

typedef struct _COLORSPACE
{
  BASEOBJECT     BaseObject;
  LOGCOLORSPACEW lcsColorSpace;
  DWORD          dwFlags;
} COLORSPACE, *PCOLORSPACE;

typedef struct _COLORTRANSFORMOBJ
{
  BASEOBJECT  BaseObject;
  HANDLE      hColorTransform;            // Return from DrvIcmCreateColorTransform
} COLORTRANSFORMOBJ, *PCOLORTRANSFORMOBJ;