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 75, Issue 5
Displaying 1-11 of 11 articles from this issue
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Special Topics: Taking a Picture of Cultural Assets. 1
Original Paper
  • Optimum Tone Reproduction for Oil Paintings
    Jing Geng, Hirokatsu Shimizu, Naokazu Aoki, Hiroyuki Kobayashi
    2012 Volume 75 Issue 5 Pages 389-395
    Published: 2012
    Released on J-STAGE: October 23, 2013
    DOIhttps://doi.org/10.11454/photogrst.75.389
    JOURNAL FREE ACCESS
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    Tone reproduction, an input/output property of light-dark information is one of the most important image qualities of an image system. Optimum tone reproduction curves have been proposed for imaging systems. But in paintings the tone reproduction itself has not been discussed because of difficulty of its quantification. In the preceding paper, we investigated optimum tone reproduction for line-drawings by making them from photographs by non-photorealistic rendering, controlling their tone reproduction systematically, and asking the testee to evaluate their tone reproduction subjectively. In the present paper, optimum tone reproduction for oil paintings was investigated by producing oil paintings, which are acceptable as oil paintings for everyone, using a similar method to that employed in preceding paper. As a result, it was found that a darker image was preferred for low-key image and a lighter image was preferred for high-key image for oil paintings, compared with photographs and line-drawings. Chroma of images acceptable as oil paintings for everyone is higher than that of photographs of optimum tone reproduction, but its level depends on kinds of image such as landscape and portrait. Chroma as high as 20 is required for landscape images and that as low as 10 is required for portraits.
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  • Research of Image Correction Algorithm Using the Structures of Face Image (I: Verification of Benefit about Remarkable Point)
    Shoji Yamamoto, Takuya Yamauchi, Kunitoshi Yabe, Nobutoshi Ojima, Yasu ...
    2012 Volume 75 Issue 5 Pages 396-407
    Published: 2012
    Released on J-STAGE: October 23, 2013
    DOIhttps://doi.org/10.11454/photogrst.75.396
    JOURNAL FREE ACCESS
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    We have analyzed an exquisite technique of image retouch by detecting remarkable points of expert photographer. These remarkable points indicate an attention point of observed image, and will change the point according to the retouch task. It is very important information to explore the expert skill and analyze the operation procedure. Therefore, in this paper, we constructed the system to measure the remarkable point accurately, and investigated the relationship between remarkable points and retouch operation by comparing expert and amateur. As the result, it was clear that expert subjects observed all over the image and watched the unnatural feature such as bruise, sagging skin, and blood vessel. On the other hand, with the retouch task for color adjustment, it became clear that the expert referred to the surrounding white point for adjustment of skin color, as opposed to the amateur almost observing only the skin color domain. Therefore, we conclude that the measurement of remarkable points is very useful for detecting the attention points and analyzing retouch of color reproduction with referred points.
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  • Enhancement of Radiation Sensitivity on Silver-Salt Photographic Materials by Post-Exposure Latensification with Red Light at Low Temperature
    Ken'ichi Kuge, Naohiro Miyazato, Nakahiro Yasuda, Satoshi Kodaira, Hir ...
    2012 Volume 75 Issue 5 Pages 408-415
    Published: 2012
    Released on J-STAGE: October 23, 2013
    DOIhttps://doi.org/10.11454/photogrst.75.408
    JOURNAL FREE ACCESS
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    During the radiation exposures to silver-salt photographic materials, small and undevelopable latent sub-image specks (LSIS) are often formed at several sites, and so the dispersion of photolytic silver clusters reduces the sensitivity. We examined the effect of post-exposure latensification with red light at low temperature, in which LSIS was reconstituted to increase the sensitivity. The grain density (GD) of the tracks increased when the photographic film irradiated with heavy-ion beam was exposed with red light at -30°C. This effect is thought to be similar to the Herschel effect. When LSIS absorbs red light and so an electron in silver atom is excited to conduction band of silver halide, another LSIS captures the electron to grow into a developable latent image speck. The exposure at low temperature inhibits the red-light sensitivity of chemical-sensitization centers. The large effect was obtained in cases that the GD was small, such as photographic plates were exposed with ion beam of less energy-loss or developed with weak developer.
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Technical Report
  • Microphotographic System for Ultra Long-Term Preservation Using Gold-Layer Photography
    Ken'ichi Kuge
    2012 Volume 75 Issue 5 Pages 416-421
    Published: 2012
    Released on J-STAGE: October 23, 2013
    DOIhttps://doi.org/10.11454/photogrst.75.416
    JOURNAL FREE ACCESS
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    Problems in preserving documents by analogue and digital systems are considered, and the gold-layer photographs that are capable of recording documents at a reduced scale are proposed for the solution to preserve documents compactly for a long-term. In the gold-layer photographs images are printed by using a gold layer onto ceramic bases, such as glass plates. As the image consists of chemically-stable substances, it cannot deteriorate easily, and the images can be preserved in a place without special preserving equipment. Moreover, since this has quite a high resolution, it can be reduced to such a small size.
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Abstracts for SPIJ’s Fall Conference in 2012
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