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- W2504497262 abstract "AbstractA new method is described of measuring the acutance of photographic materials. This method is based in principle on Fourier analysis by Fraunhofer diffraction, using a diffractometer for measuring the power spectrum. The optical diffractometer is checked by means of simple patterns such as a single long narrow slit and a square-wave amplitude ruling (Grayson type). The photographic application is made in the following manner: a Grayson type ruling having a long period is imaged on the tested emulsion. The spatial image period must reach about 400 μ to avoid overlapping of light diffusion from neighbouring clear stripes. The samples are immersed in a liquid of the same refractive index as that of gelatin to eliminate phase modulation by non-flatness of the gelatin surface. The amplitude and the transmittance variation of the photographic image can be reconstituted from its monochromatic power spectrum. A psychometric study suggests good correlation between the number of harmonics contained in an im..." @default.
- W2504497262 created "2016-08-23" @default.
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- W2504497262 date "1963-05-01" @default.
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- W2504497262 title "Spectrometric Measurement of the Acutance of Photographic Materials" @default.
- W2504497262 doi "https://doi.org/10.1080/00223638.1963.11736907" @default.
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