As CEPS comes into wide use, it is demanded that as few makeovers as possible have to be done by improving simulation accuracy in softproof terminals thereof. This article describes some basic operational expressions known in the simulation of colors by the use of halftone dots, and also elaborations and improvements made on these operational expressions in embodiments into equipments therefor surveying some patent documents and publications.

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In electronic publishing systems, the one of the most important technologies is the electronic halftoning. The halftoning technology contains the functional equivalent of photographic contact screen and dithering. In this paper, Only a brief understandable explanation for digital halftoning could be presented. This paper consists of four parts. In the scope, it is insisted that the electronic technology, and in particular computer technology, must understand what the artists and craftmen have accomplished with existing techniques in order to get a better result than traditional methods. The electronic screen made by using lookup table which is stored on the digital memory is explained in the first chapter and some examples of dithering methods are described in the second chapter. The last chapter is applied to the discussion of moire phenomena in which the declaration of relationship between spatial frequency componets of screened image and moire-free design method has been tried.

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Nowadays, radiation curing is a well-estabished technology that has developed and grown rapidly on an industrial scale. More recent application is laser-induced curing. The practical development of these technologies obviously requies new photosensitive materials. This article is mainly concerned with an overview of the present status for the photoinitiation step of light-induced polymerization reactions. Recent and relevant results concerned with the quantum yields for radical formation and reactivity of radical and cationic photoinitiators will be discussed in this paper. Only basic research data relating the important topics of photochemical reactivity will be mentioned throughout.

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Setup, determination of scanning conditions to obtain a preferred reproduction with a color graphic arts scanner, an operator setted up can be estimated from four color reproductions by using simplex method.

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The line width and its O. D. distribution of an extracted line picture were studied on the effects of various angle of incidence in photographic enhancemen and density extraction, employment of light scattering as a picture processing. The maximum O. D. value of extracted line picture was insensitive about angles of incidence of beamliked light of incidence. It is clear from the rusult that the processing lightsource is no need of parallel rays. The emphatic power or the value of amplification of this process, namely, the product of extracted line width of the line by maximum O. D. value was strongly depended on this maximum value rather than line width.

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A high quality lithographic printing technology was developed by using only three colored ink (cyan, magenta and yellow) without black ink and by superposed printing in shadow area. The technology included the following two methods. 1) Superposed printing in shadow area on ordinally printed images without UCR. 2) A new magenta ink with less absorption than a process ink in blue spectrum region, which could use larger amount of yellow ink. As a result, the highest reflectance density was enhanced from 1.8 to 2.4, which afforded higher contrast between highlight and shadow area. Secondary, broader color range was obtained in green and red region.

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a. Color is the most important elements in producing excellent prints, but also proper printabilies (rheology, interfacial balance with water, drying) of ink must be considered, because they relate closely to print quality.
b. In the printing field, special functional colors such as golds, silvers, metallics, pearls, fluorescents and phosphorescents, etc, are in practical use.
c. More than 80 standards related to colors are prescribed by JIS now, and new standards and revisions are added every year.

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It became increasingly important to get color images with good quality for various printings, such as inkjet printing, thermal printing and also conventional printing, from TV pictures or CRT pictures generated by computer. In order to get good quality images, it is important to evaluate and analyze the images, and it is necessary to reflect those obtained resulte for image designing. Starting from the basic interprelations on the image analysis and evaluation, in the series, practical applications of these fields will be also presented. At the beginning, in this paper, the outline of the image analysis and evaluation is described.

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