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Calibration curve and scanner
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Optical density is a function of the wavelength of the light source
•
Flat-bed color photo-document scanner use broad band fluorescent visible
light sources
•
OD it will also depend on the sensitivity of CCD array
▪
Calibration curve is
scanner dependent
▪
Need to have stable
performance of the
scanner before
using it for
calibration or for
film digitization