Photographic emulsions calibration curves

FIGURE 7-7. Typical photographic emulsion calibration curve. 

FIGURE 8-7. /yand D photographic emulsion calibration curve (From data of Table 8-4). 

FIGURE 8-8. A photographic emulsion calibration curve plotting percentage transmittance versus relative intensity on a log—log scale. 

FIGURE 8-10. A photographic emulsion calibration curve using a seven-step neutral filter and the germanium spectral emission line at 3039 A. 

The contrast (y) of a photographic emulsion also is dependent on wavelength, where the contrast generally increases as the wavelength increases. A calibration curve for an emulsion, therefore, is only correct at the particular wavelength at which it was obtained. Spectral sensitivity curves for some commonly used spectral plates and films are shown in Figure 6-8. 

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