678 



HANDBOOK OF PHOTOGRAPHY 



Positive Films. — Release prints are made with relatively slow-speed high-contrast 

 fine-grain noncolor-sensitive emulsions. The spectral characteristic of the Eastman 

 1301 type has already been shown in Fig. 5. The D-\ogio E curves and the time- 



2.60 



2.40 



2.20 



2.00 



1.80 



1.60 



1.40 



1.20 



1.00 



0.80 



060 



0.40 



0.20 

 



2.60 

 240 

 220 

 2.00 

 1.80 

 1.60 



1.40 1' 

 w 



1.20 S 

 o 



1.00 



om 



Q60 

 0.40 

 0.20 



8 



10 



12 



Fig. 20Z). 



2 4 6 



Minufes 

 -Time-gamma curve of Eastman duplicating positive No. 1362. 



3.0 



2.0 







0.6 1.2 1.8 2.4 



Log Exposure (relahVe^ 



Fig. 21A. — D-logio E curves 

 of DuPont duplicating positive 

 No. 204. 



1 2 3 4 5 



Minu+es 



Fig. 21JB. — Time-gamma curve of Du- 

 Pont duplicating positive No. 204. 



Fig. 22.4. — Spectrogram of DuPont duplicating positive No. 204 (tungsten). 



gamma curve are illustrated herewith in Fig. 18, and the same characteristics for the 

 corresponding DuPont positive, together with a wedge spectrogram, appear in Fig. 19. 

 The former were obtained with the D-16 developer, the latter with the PD-2 developer, 



I 



