At the Japan Photo Archive, we are collecting, preserving and making the database of "photographic original films and plates" which are in danger of deterioration/dissipation. "photographic original films and plates" are basic documents that directly recorded photographic images. In this paper, I’ll introduce a method of making a "photographic original films and plates" archive at the Japan Photo Archive, which is done based on document characteristics of them revealed through the investigation of "photographic original films and plates".
Vinton Cerf, often called “the father of the Internet,” and now chief Internet evangelist at Google, spoke at the 2015, that future generations will have little or no record of the 21st Century. He worry a great deal about that the documents and data currently stored in various storage media risk being lost. In the report, the current state of semiconductor nonvolatile memory especially NAND type memory which may become mainstream of storage medium in the future is shown. It is technically possible to create the storage memory for ultra-long term preservation and it is an importance to appeal the necessity of it.
This paper introduces a method for long term storage of important data by optical discs. In addition, the requirements of optical discs for long term storage are explained from the points of distinctive features of optical discs, differences from the other storage media and appropriate handling method.
Photography has rapidly changed from silver-halide to digital in late 1990’s. Printing materials have also changed to several different systems (i.e. Ink-jet, Thermal dye transfer, Electro photography). Here I explain about the history of silver-halide photographic printing materials, image forming mechanism, image stability and technologies.
Effects of silver-halide base to the preparation of gold nanoparticles by gold-deposition development were analyzed by postfixation development on lonely latent image specks after the removal of silver halide or carbon-replica observation of silver-halide grains with depositing gold particles. Results of the postfixation development suggested that the acceleration of development rate by addition of ascorbic acid (AA) in the developer was due to the direct reduction of Au (I) ions by AA. Gold particles formed on silver halide surface at high concentration of AA had many fine protrusions, and participation of silver filaments formed by reduction of silver halide with AA was suggested. This acceleration by AA was more remarkable on octahedral grains than on cubic grains, and was due to the difference of latent image formation process. Effects of the crystal faces on silver-halide grain to the gold-deposition development process itself were not so significant.
It is known to be the optimum caliber for a pinhole camera. In this study, first, the existence of the optimum caliber was verified using digital pinhole cameras. Next, the relationship between the focus length and the resolving power was experimentally clarified. In addition, a pinhole camera with more than 4m of projection distance was developed to take a picture of the lunar craters, and we actually succeeded in filming the craters.
The enhancement of the efficiency of latent image formation is essentially important for high-speed silver halide (AgX) emulsions including current nuclear emulsions. However, it is necessary to depress the efficiency of latent image formation for the detection of dark matters (DMs), since DMs create as many as 〜1000 electron-hole pairs/ grain with diameter of 〜40 nm. For this purpose, the guiding principles for the nuclear emulsion to detect DMs have been proposed by applying to it for the first time the concept of the detective quantum efficiency with three requisites (efficiency of latent image formation, gradation, and noise). Some experimental results of the examination of the proposed guiding principles are described for the present by use of nuclear emulsions with 〜40 nm AgX grains.
Safflower red pigment was extracted from a dried flower cake “BENIMOCHI” produced in Yamagata Prefecture by a traditional method. Green metallic luster was observed from the pigment film immobilized on the black base. A reflection maximum around the wavelength of 550 nm was found on the measured spectrum, which corresponded to a green color. There was no angle dependence on the wavelength for the reflection maximum. It was found that the metallic luster occured at the air/film or glass/film interface, and contained poor linearly polarized components. Therefore, these results suggested that the green metallic luster is similar to the reflection of real metallic materials.