This enumeration specifies extra channel's color type.
Values:
    
        
            | IG_EXTRA_CHANNEL_COLOR_TYPE_Unknown | Unknown color type. | 
        
            | IG_EXTRA_CHANNEL_COLOR_TYPE_Colorspace | Regular color specified by color space and color value. | 
        
            | IG_EXTRA_CHANNEL_COLOR_TYPE_Vendor | Color specified by vendor and color IDs. |