emulsion
base Schicht
receiver
à zu | Schichttrager fj 7^ Fring NM
rial -—N — f/ =
o: =A : E: x Rl an
: ,
a) b) c) d)
Fig.1: Arrangements for measuring the transmission density (after American
National Standard PH2.19-1959 Diffuse Transmission Density).
The density values obtained by means of these arrangements are
tio called: ; t
e a) and b) totally diffuse density. Both arrangements furnish the
same results; the supplement "totally" is only valid for the strict
ns observance of the conditions; in practical, approximated cases the
mm (9 supplement is left out.
C) specular density.
d) double diffuse density.
In b) and c) the parallel incident light is often realized with
= an angle of 2 Qi.
&
2
5
TU
d m
E
on C
all 20
specular | gerichtete 3
density K" Dichte (c) double
optische diffuse ass
Dichte density )
i (b) (d)
(9 be 2
LL 1 11-130 E I [LL I.
oc; 28 mm. 25%. 5% 30% 50° 70° 90°. ou;
00 19. 2,5309 750°, 709 909 9097 —- 777-7 909 a,
tice
llu- É
e. Fig.2: Density of a high sensitive, coarse-grained film material as
function of the measuring geometry for three pieces of film of
different density (after Thomas 1973, p. 839). On the left the
axis angle of the illuminating light is a. = D ro - const; the
axis angle of the receiver varies from a, = 1° to 90°. On the
‘right the axis angle of the receiver is a’, = 90° = const and
the axis angle of the incident light varies from a. = 5° to 90°.
ng The letters in brackets indicate the measuring geometries
graphed in fig.1.