Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
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Volume 56, Issue 6
Displaying 1-7 of 7 articles from this issue
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  • Analysis of the formation process ofsulfur+gold sensitization specks by X-raydiffraction
    Kenichi KUGE, Isao SHINOHARA, Minoru TANAKA, Iwami HIGASHI, Nobuo MII
    1993 Volume 56 Issue 6 Pages 411-418
    Published: December 25, 1993
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.56.411
    JOURNAL FREE ACCESS
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    Crystal phases of sensitizing specks formed onsulfur+gold sensitization treatment was analyzed by X-ray diffraction. Gold-silver sulfides were formed from silver bromide grains by 1) separate addition of sodium thiosulfate and gold (III) sodium chloride, and 2) addition of gold-thiosulfate complex solution. By greater adding amount of sensitizer to silver bromide, AgAuS was formed. By adding gold-thiosulfate complex solution the product changed from AgAuS toAg3AuS2 with decreasing the mole ratio of sensitizer to silver bromide. Ag2 S was not observed in any case. This suggests that thesulfur+gold sensitization speck is homogeneous and consists of one component, that isAg3AuS2, or the mole ratio of gold and sulfur in sensitizing speck is1: 2.
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  • A Fast Algorithm for the Computation of Color Hardcopy Color Gamuts
    Masao INUI, Yoriko NAKAYAMA
    1993 Volume 56 Issue 6 Pages 419-423
    Published: December 25, 1993
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.56.419
    JOURNAL FREE ACCESS
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    We earlier developed a fast algorithm for computing the color gamuts of dye sets used in subtractive color mixtures in which Lambert-Beer's Law holds. This fast algorithm is based on the concept of dye amount space. In adapting this algorithm to reflection prints, we had to deal with the fact that the relationship between reflection density and dye amount is nonlinear. This problem was solved by using a function to convert reflection density to transmission density, which is linear in relation to dye amount. Because Beer's Law holds, multiplication of a given dye amount, expressed in an arbitrary unit, by the spectral transmission densities for that arbitrary unit, yields the spectral transmission densities corresponding to the given dye amount. After the densities of all three dyes are calculated, the total transmission density is converted to reflection density. In applying the algorithm to hardcopy systems, we faced the additional problem that, unfortunately, Beer's Law does not apply to the dyes in some of these systems (e.g. some thermal dye transfer systems), even in the domain of transmission density. In these cases, the spectral transmission density distributions do not rise proportionally with dye amount, but, instead, distort with the increase of dye. However, by establishing and interpolating these distributions, the same algorithm which we applied to conventional photographic materials also proved accurate with hardcopy systems. This accuracy was confirmed by comparing color gamuts computed through the algorithm with observed values.
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  • Review of Medical Imaging Technology
    Sumio MAKINO
    1993 Volume 56 Issue 6 Pages 425-427
    Published: December 25, 1993
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.56.425
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  • The Progress and Trends of the Intensifying Screen and Medical Film System
    Chika HONDA
    1993 Volume 56 Issue 6 Pages 428-433
    Published: December 25, 1993
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.56.428
    JOURNAL FREE ACCESS
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    The system of intensifying screen and medical film (S/F system) is the origin of the medical imaging. The historical events and recent technical developments of the S/F system will be reviewed and discussed. The key technologies of the system are the developments of the silver halide grains in medical film and of new intensifying screens.
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  • Recent Progress in Computed Radiography
    Kazuo SHIMURA, Masamitsu ISHIDA
    1993 Volume 56 Issue 6 Pages 434-439
    Published: December 25, 1993
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.56.434
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  • Perspective of Radiographic Image
    Observation by Filmless System
    Masaomi TAKIZAWA
    1993 Volume 56 Issue 6 Pages 440-444
    Published: December 25, 1993
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.56.440
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  • Helical Scanning
    Three-dimensional X-ray CT Scanner
    Yusuke TOKI
    1993 Volume 56 Issue 6 Pages 445-448
    Published: December 25, 1993
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.56.445
    JOURNAL FREE ACCESS
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