one Ve 
OA CODE VOTRE TNT 
nnn Re Uh montra radar NE datée. Pic C o: d MN nin DECUS God 8 
not describe the scattering properties unambigously). The coefficient 
is for the investigated film types graphed in fig.4. , 
18 + BL 00000000. eo o 3-00 
= eet 22200000 AV 
= IR 
  
10—-—-- —————4 + + + tM —— > 
1.0 2.0 optische Dichte 
diffuse density 
(€ 
Fig.4: Callier coefficients Q of different film types, developed to 
nearly the same gradation ( y = 1.6 + 5%, except for Tri-X 2403, 
y = 0.6). 
PX = Kodak Plus-X Aerographic Film 2402, 
TX = Kodak Tri-X Aerographic Film 2403, 
HD = Kodak High Definition Aerial Film 3414, 
IR = Kodak Infrared Aerographic Film 2424, 
AV = Agfa Aviphot Pan 30, 
no.3 = Kodak photographic step tablet no.3 (calibrated), 
W = Kodak Wratten Neutral Density Filter No.96 
(for comparison only). 
Q is the ratio of specular density to diffuse density. 
3. RESULTS 
In fig.5 the findings of some selected measurements are tabulated as 
correction diagrams for the diffuse density. The correction curves of ( 4 
Gretag D 33 show an almost similar behaviour of all film types with a 
small increase from the range of lower densities to higher densities. 
Another but for all sorts of film similar effect show the curves of the 
Macbeth TD-100. Compared to it, the curves of the Macbeth TD-102 are 
very irregular for the different films. The Kodak High Definition Film 
reveals extremely high corrections*/. A measured density of 2.71 has to 
be corrected by 0.45 to obtain the theoretical value of 2.26. 
Entirely diverse correction curves also show the results obtained with 
the Joyce-Loebl microdensitometer. Measurements performed on the High 
Definition Film require positive corrections which are nearly propor- 
tional to the density. Measurements on the Kodak Tri-X have to be cor- 
rected only in the range of higher densities (as of about 1.2 D, but 
A check made under varied conditions (with an aperture of 3 mm) 
yielded the same result.