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Volume 44 (1981)
- Issue 6 Pages 461-
- Issue 5 Pages 393-
- Issue 4 Pages 291-
- Issue 3 Pages 167-
- Issue 2 Pages 79-
- Issue 1 Pages 1-
Volume 44, Issue 5
Displaying 1-7 of 7 articles from this issue
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1981 Volume 44 Issue 5 Pages 393
Published: October 28, 1981
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (3230K) -
1981 Volume 44 Issue 5 Pages 394
Published: October 28, 1981
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (4826K) -
from Electronic Imaging Point of ViewTeruo YAMANOUCHI1981 Volume 44 Issue 5 Pages 395-405
Published: October 28, 1981
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (1242K) -
Yoshizumi YASUDA, Yasufumi EMORI, Kazuo YARITA1981 Volume 44 Issue 5 Pages 406-417
Published: October 28, 1981
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIn order to examine the effects of spatial frequencies on image sharpness, a photographic image was digitally processed concerning to the spatial frequency, as follows;
(1) Enhancement of spatial responses at a definite bandwidth and various frequencies; 0.5, 1.0, 2.0 and 4.0 lines/mm.
(2) Inhibition of spatial responses at a definite bandwidth and the spatial frequency.
(3) Cutoff of spatial response at the various frequencies; 1.0, 2.0, 4.0 and 8.0 lines/mm. These images were psychologically evaluated about the impression of sharpness. It was concluded that a particular spatial frequency of 0.5 lines/mm had degraded the sharpness. Frequencies higher than 8.0 lines/mm had no effect on the sharpness.
This result may ascertaine the assumption of the two channel theory in the visual information system.View full abstractDownload PDF (20960K) -
Effect of Residual Thiosulfate ions and Stabilizing bath on the StabilityTeruaki HISANAGA, Tadashi OINOUE, Etsuo FUJII, Toshio MIYAGAWA, Norio ...1981 Volume 44 Issue 5 Pages 418-423
Published: October 28, 1981
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe effects of residual thiosulfate ions on the image stability in processed color paper were discussed to an accerelated test (70°C, 75% RH) and sunlight exposure. The amount of residual thiosulfate ions was determined as S2O2-3 by methylene blue method.
On the accerelated test, the presence of 0.1-1.0μg/cm2 of S2O2-3 resulted the remarkable effect to the fade of cyan dye and also increased the yellow stain.
On sunlight exposure, the presence of the residual ion showed little effect to the image fading, and the fade of magenta dye was slightly retarded by much increase of residual thiosulfate ions.
Color prints treated with a stabilizing bath at pH 3.6 after rinsing with water showed the relaxation for dark fading, light-induced fading and yellowing. It is desirable, therefore, to adopt the stabilizing bath treatment for protection of the fading.View full abstractDownload PDF (726K) -
Ikuo OHSAWA, Michio KURODA, Masao INUI, Souichi KUBO1981 Volume 44 Issue 5 Pages 424-430
Published: October 28, 1981
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIt has been known that objective sharpness which correspond with subjectively preferred sharpness of portrait photographs is lower in some degree than that of required for the other sorts of photographic scenes. In the case of color photography, a higher subjective quality for color portrait photographs also obtained by a degradation of the objective sharpness of the photographic system. As the magenta image sharpness definitely contributes to the subjective evaluation of image sharpness than those of cyan and yellow, the preferred sharpness for color photography is performed by a degradation of the objective sharpness merely in the magenta image. Also an incompatible requirement, that is, lower the objective sharpness only for a portion of human complexion and maintain it higher for remainders in a color portrait photograph is achieved by a degradation of the magenta image sharpness but maintain maximum system sharpness in cyan and yellow images. The proper degradation rate of the magenta image sharpness intended for the preferred sharpness of color portrait photography approximately 30% in information volume was obtained.View full abstractDownload PDF (4253K) -
Adsorption characteristics of Acid and Na salt type Triphenylmethane dyesYoung Soon KIM, Yasusuke TAKAHASHI, Toshibumi SAKATA1981 Volume 44 Issue 5 Pages 431-436
Published: October 28, 1981
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSTwo kinds of sensitizing dye, acid type (Y=H) and Na salt type (Y=Na) of triphenylmethane dyes such as Rose bengale and tetrabromophenol blue, show different adsorption characteristics on zinc oxide powder in alcoholic solution at 20°C. The difference of adsorption characteristics of dyes on zinc oxide were investigated. The results are:
(1) The difference of adsorption activity of xanthenes and phthaleins dyes, which are triphenylmethane group dyes is small. And the difference in adsorption activity of dyes having carboxylic and sulfonic radicals is small too.
(2) Acid type and Na salt type dye of xanthenes and phthaleins shows different adsorption characteristics. The acid type dye of xanthenes and phthaleins is more adsorbable than Na salt type dye.
(3) The acid type dye which exhibited Langmuir linear relationship from a mono-layer without interaction between the dye molecules. However, Na salt type dye is unsuited to Langmuir equation which is delocalized and is movable in adsorbed state of dyes.
(4) Carboxylic or sulfonic radical of dyes will be attracted to adsorption site, and then hydroxyl radical will be attracted with smaller adsorption force than the former radical.View full abstractDownload PDF (756K)
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