When implementing {HEAD ~ the mapping} for {TAIL ~ negative film} , the multiplicative and additive constants are determined from the reference, e.g. green, band according to the following equations: ##EQU4## 
for
When implementing { HEAD ~ the mapping } for { TAIL ~ negative film } , the multiplicative and additive constants are determined from the reference , e.g. green , band according to the following equations : # # EQU4 # #
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH