ST N Re Et SZ ER us E 
: RUE RUE AAACN SET rp re e ESS E eei > 
= e = = ea et A, mh, 
  
  
| 116 
| 
12 BOUSKY 
In Figure 13, line C indicates a maximum limit represented by the 
|| test chart contrast. Line D represents a theoretical resolution limit 
|| determined by the diffraction limiting aspect of the aperture. Line E 
T represents a minimum contrast read-out limitation imposed by the gran- 
ROW ularity of the emulsion in a lens-film system, and the intersection of 
a line E with curve A, therefore, locates line F which represents the 
rol 
ing ES 
| phot I 
| Grol Th 
| Ti x 
I 
l 
| 
I 
C 
and TEST CHART [ 
N | 
| 
l 
| 
x 
Ever N 3 CONTRAST 
Wor x 
cern A 3 
pret: LENS FREQUENCY | 
RESPONSE CURVE N D 
r B DIFFRACTION ————_|_ 
Wor LIMITING 
RESOLUTION 
Eur | 
i 
E N t 
! 
| 
| 
  
  
  
  
4 
  
  
  
  
  
simp 
rece GRANULARITY 
phot CONTRAST LIMIT 
part 
have i | 
pare EQUIVALENT c | [UN 
caus RESOLUTION " | | |^ IX | 
phot PENES 
whe | 2. 3 567 10 20 30 50 70 100 200 300 500 
used 
histc LINE FREQUENCY — LINES/mm 
PERCENT RESPONSE 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
| 
| 
| E TYPICAL FREQUENCY RESPONSE CURVES 
e 
| read 
| by t 
| pres 
| held FIGURE 13 
| toda 
| € resolution as usually measured in a lens-film system. It is to be noted 
Sam that curve A extends to higher line frequencies at higher response 
| phy: (less contrast attenuation) than curve B and would, therefore, perform 
Mic. better at low contrast, even though it would provide a lower reading by 
| graf resolution testing. 
as a 
has 
Are 
Maruy 
Archives