
47-1
47.1 Introduction
As the name indicates, densitometry is the measurement of optical density (OD). OD, in turn, can be
br
oadly
de
ned
as a me
asure
of th
e
at
tenuation
of ra
diant
u
x
by so
me
so
rt
of opt
ical
el
ement
th
at
ca
n
be tr
ansmitting,
re
ecting,
or bo
th
. De
nsitometry
is mo
st
wi
dely
ap
plied
in ph
otographic
sc
ience,
an
d
me
asurements
in th
is
e
ld
ar
e
co
vered
by a fo
ur-part
AN
SI/ISO
st
andard
[1
]
. e tr
eatment
he
re
fo
llows
th
at
do
cument
. e me
asurement
of tr
ansmission
an
d
re
ection
fr
om
th
e
st
andpoint
of opt
ics
ha
s
be
en
discussed by Palmer [2]. is chapter uses the single word density, without the adjective, and uses the
words “light” and ...