対称増感紙- フィルム系のWiener スペクトルのシミュレーションと実測による検証

抄録

We simulated Wiener spectra for density range with a symmetric screen-film system applying Wakamatsu's mathematical model of Wiener spectrum by the two methods, and compared with the simulated Wiener spectra and the practical measured Wiener spectra. On one method, the Wiener spectra were simulated as base of the Wiener spectrum at the double density 1.0(Singled layer method). On the another method, the Wiener spectra were simulated as base of the two Wiener spectra at the front emulsion density 0.65 and the back emulsion density 0.52. The two simulated Wiener spectra were added in every relative exposure ( Doubled layer method). On the comparison with the simulated Wiener spectra and the measured Wiener spectra, the relative errors of Wiener spectra became lower the doubled layer method than the singled layer method. The relative errors on the doubled layer method were almost less than 15% at practical useful range. Therefore, to simulate the high precision of the Wiener spectra for density range with a symmetric screen-film system, we should individually simulate Wiener spectra on front and back emulsions. It is necessary to obtain a large number of sample points for determination of the Wiener spectrum, the accurate characteristic curve and gradient curve by the sensitometry.