The invention further relates to an apparatus for calibrating a sensor which may be used for measuring {HEAD ~ color} of {TAIL ~ a color display} in calibration of the display 
of
The invention further relates to an apparatus for calibrating a sensor which may be used for measuring { HEAD ~ color } of { TAIL ~ a color display } in calibration of the display
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH