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Volume 61, Issue 1
Displaying 1-6 of 6 articles from this issue
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Shunji TAKADA1998 Volume 61 Issue 1 Pages 3-7
Published: February 25, 1998
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIn the last 20 years, photographic sensitivity and image-quality of color films have been remarkably improved. These improvement have been mainly supported by progeresses of photosensitive silver halide crystals. In this paper, progresses in the past are reviewed from the relation of photographic sensitivity and image-quality to the grain size of silver halide crystals and further mechanisms of photographic process to realize the ultimate quantam sensitivity are discussed for advances in the future.View full abstractDownload PDF (6700K) -
Takafumi NOGUCHI, Hideto IKOMA1998 Volume 61 Issue 1 Pages 8-17
Published: February 25, 1998
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSImage qualities of color negative films and digital still cameras are compared in terms of color accuracy, a number of recording levels, a resolving power or a number of pixels and a noise level. The comparison is done by using the quality factors for color accuracy, a psychological experiment and the information theory for other terms. The result shows that color negative films have an advantage in a resolving power or in a number of pixels and digital still cameras have an advantage in a noise level.View full abstractDownload PDF (1083K) -
The Design Concepts and Technologies of Monochrome Film for Processing Color Negative Film ChemicalsToshihiko IWASAKI1998 Volume 61 Issue 1 Pages 18-22
Published: February 25, 1998
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThis new monochrome film was designed to provide quicker and easier processing and printing operation for today's boom in black-and-white photography.
The design of monochrome film was guided by three concepts;
(1) Color processing by existing minilabs printed on current color paper to produce monochrome images, (2) Easy handling of minilab operators through introduction of print level compatibility with color negative film, and, (3) Sepia image print by any minilab at all times.
In the present report, these design concepts and technologies are described.View full abstractDownload PDF (2441K) -
Rikio INOUE, Sumito YAMADA, Satoru TODA1998 Volume 61 Issue 1 Pages 23-27
Published: February 25, 1998
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSWe developed a new type of X-ray film processing system, which consists of new chemicals using iso-ascorbic acid as developing agent, a new film, a new screen, and a new processor.
The system has advantages of photographic speed constancy for a long term, prolonged cleaning cycle with reduced silver sludge in developer, and of less waste solution, over ordinary processing systems.View full abstractDownload PDF (558K) -
Norimichi TSUMURA, Hideo NATORI, Takayuki KAWAGUCHI, Hideaki HANEISHI, ...1998 Volume 61 Issue 1 Pages 28-32
Published: February 25, 1998
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSAutomatic density correction has been used to correct density failure in printing color negatives. The method, however, is not always significant to correct color balance and density since the negative density which is used to calculate the correction coefficient is only measued in several fixed regions. In this paper, a new method is introduced to correct density failure considering the scene content. The complexity of the image calculated by using discrete Wavelet transformation with Haar function was applied to segment the negative film image dynamically. The densities of those obtained regions were measured and various parameters were calculated to correct printing color negatives. It is shown that the image manupulation method proposed in this paper is effective for density failure correction of 186 sample images.View full abstractDownload PDF (9679K) -
Dependence of Image Quality of Output Prints on Pixel Number of Input CameraShin OHNO, Masayuki TAKAKURA, Naoya KATO1998 Volume 61 Issue 1 Pages 33-38
Published: February 25, 1998
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIn the digital phtography, the input data capacity is the key factor for the image quality of output prints. The data capacity is basically decided by conditions of the input camera imager.
This paper discusses the relation between pixel number of print and its image quality. The image quality of simulation pictures having different pixel numbers were evaluated by subjective viewing and objective image structural analysis. The correlation between pixel number of prints and their image qualities showed a distinctive relation. This result sugests the design of optimum pixel numbers of digital camera producing digital photography prints.View full abstractDownload PDF (3388K)
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