The topics of advances in nonimpact printing technologies are attractive and exciting ones in the world of hardcopy and pictorial imaging. The most of new color hardcopying systems are based on the PPC (Plain Paper Copying) like method recording pictures on the paper by supplied colorants. That method follows to the same principle of the printing technology. The output pictures of the novel nonimpact printing systems are useful evaluating media on the process of the graphic arts. Moreover some systems are available to prepare the color printed matters in extra small order and to develop the new market.

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Structures and reconstruction mechanisms of a new type horogram “TRANSPARENT TYPE HOLOGRAM” were analized. This hologram is one of the relief ones which usually have two dimensional structure, but it is considered to have three dimensional structure. Firstly, reconstruction efficiencies of it were approximated to reflection rates on plain surface boundaries multiplied by reconstruction efficiencies of transmitting type hologram. Then a more strict method was explained for a simple model. Secondly, imaging theories were examind for a primitive type as MODEL 1, an ordinary type as MODEL 2 and this tipe hologram as MODEL 3. There, the depth and the pitch of relief, and the distance between two surface-boundaries, that is, the thickness of thin film were showed to be significant. Finaly, practical applications were proposed according to typical models of reflection rate curve. Here, we analized this hologram as a reflection type. But, of course, the hologram is applicable to a transmitting type.

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The small automatic two colour printer VS-1000 which we have developed is characterized by introducing Toray Waterless Plate and full electronic control of mechanisms, and also we have developed, as one of the key technologies of the printer, “VS-1000 total resister pin system”. This system makes it possible for automatic plate changing to be compatible with resister pin system, and consists of two sub-systems “Plate making resister pin system” and “Automatic plate feeding and postioning system”. In this paper, we mainly explain the construction and effect of the latter “Automatic plate feeding and postioning system”. The greatest feature of this system is to introduce Toray Waterless Plate with polyester (PET) base film, named “Film Base Waterless Plate”. In conclusion, in the case of using a processed “Film Base Waterless Plate” repeatedly, the repeatability of the printed posion due to this “Automatic plate feeding and positioning system” is within ±25μm, Therefore, the total accuracy of “VS-1000 total resister pin system” is, we suppose, about ±45μm.

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The color and tone reproduction in off-set printing is governed mainly by the dot properties, so the evaluation of dot quality has been important subject in printing industry. Evaluation of dot quality is carried out by using the optical properties of dots. Usually, the dot area is measured by a densitometer. However we employed a spectral photometer in order to analyze the dot quality in further detail. Ideally shaped dots can be obtained by using an offpress proofing system named Color Art and we can determine the dot area without ambiguity. In case of ideally shaped dots, dot area is the sum of two components. The first component is determined by the real size of dots, while the second is caused by the apparent increase of dots due to the light scattering in the substrate. The contribution of the first and second components is determined by the numerical optimization by using the reflectance and transmittance values of the solid area.

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This paper presents a lot of basic digital image processing algorithms using a digital computer for pre-press images, In chapter 2, typically image processing system is shown. Chapter 3 contains image analysis algorithms, image filtering methods, digital image display algorithms, data compression algorthms and pattern recognition methods. And chapter 4 is conclusion.

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We have been insisting to improve several items on the structure and function of the present color scanner. These proposals are originated from our novel color seperation theory, so-called “Color Separation System based on the printed (halftone) image”, We think our method should take the place of the presently prevailing so-called photomechanical masking system which is based on the photographic continuous tone image. Our novel color seperation system is founded on the technical idea to devide the concept of “Density” of a printed image on a paper into “Area of a dot” and “Reflective Density of printed ink”. As the practical procedure, it is necessary to measure the diameters or the lengths of one side of the specified dots which are arbitrarily selected from the H, S and M parts of the halftone image in every step of color-separation, plate-making and printing process. Our process consists of four points control system in tone rendering and the tone-rendering-first-ism. The four points necessary include H, S, M and the position of 50 percentage dot fraction. As compared with our process, now prevailing photomechanical masking process consists of three points (H, S and M) control system and the color-correction-first-ism. The two processes must be discriminated clearly. In this paper, in order to realize a better color scanning technology we propose five important items as follows: 1) Preparation of a specially designed color densitometer for color originals to be scanned. 2) Tone-rendering-first-ism which schould be observed through the structure, function and the control panel design of the scanner. 3) The scanner should have structure and function which enable to accept and give the informations from four points control system in tone rendering without any difficulties. 4) Computer aided preset system based on the tone-rendering-first-ism and four points control system should be built in or connect to the scanner. 5) To develop the system which can supply necessary informations from the characteristic curve of each color original to be scanned. Based on these principles, we prove with experiments the rightness of our theory.

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