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6. CONCLUSIONS 
The paper attempted to demonstrate that photographic emul- 
sions are able to image a large subject range without loss of 
information if properly exposed. Certain aspects were not 
considered such as the exposure-ditference variations within the 
: à ee image format resulting from loss of illumination with an 
04 increasing imaging angle, or the apparent noise in photographi- 
00 02 04 D6 03 10 12 14 16 18 20 22 24 26 28 30 cally recorded areas of uniform appearance. 
4500 4 
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ud have resulted in a decision to scan photographs in density mode 
i ds I using the density range determined for the photographs through 
c 2000 4 ET densitometer measurements. This approach yields good results 
9 15004 : for all kind of transparent images including contrast reversal 
ud : without the need to subject the digital data to a modification 
A is based on histogram manipulation. The simulated data obtained 
is D. in this investigation confirmed our experiences gained when 
scanning photographic images. 
  
  
  
  
  
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Figure 7. Histograms for the seven simulated images derived 
for the subject ranges 1 to 7 from Figure 6. 
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