A method of obtaining a multi-color reproduction
(57) Abstract:Use: in the manufacture of multi-color printing reproductions. The essence of the invention: a method of obtaining a multi-color reproduction, which consists in the successive coating the surface of printing material layers of paint in various colors, carrying a monochrome bitmap images with different frequency, realize that on the surface of printing material is applied colorful layers of different colors, each of which carries a monochrome bitmap with the frequency determined by the dependencies listed in the description. 1 Il. The invention relates to printing processes and can be used in the manufacture of multi-color printing of reproductions.A method of obtaining multi-color reproduction, which consists in the successive coating the surface of printing material layers of paint in various colors, carrying a monochrome bitmap with the same frequency. The main disadvantage of this method is the occurrence of the moire phenomenon when applied to each other monochrome bitmap images Odincovo).The closest technical solution to the present invention is a method of obtaining a multi-color image, which consists in the successive coating the surface of printing material layers of paint of different colors, and monochromatic image of each color has its own frequency (see kN. Modern printing abroad. Reproduction processes. Edited by Prof. Suslova B. A. M. Book, 1987, S. 103).The main disadvantage of this method is that the determination of the desired screen frequency for each monochromatic image is carried out empirically, that is rather time-consuming operation.The method of determining the line-screen monochrome images is further complicated due to the fact that each colorful triad and grades of paper it should be done again. In addition, he, like any empirical method, inaccurate, and therefore, has a low reproducibility of the results. All this leads to lower quality multi-color reproduction.The aim of the invention is to improve the quality of multi-color reproduction. This objective is achieved in that a method of obtaining material layers of paint of different colors, each of which carries a monochrome bitmap with the frequency determined from the expression
0,0007 where the distance between the centers of the printing raster elements;
b the distance from the observer's eye to the image;
bthe reflectance of the paper;
tothe reflectance of the paint.We conducted a patent search revealed no method of obtaining multi-color reproduction with these distinctive features and why they are significant.The essence of the method lies in the fact that to determine the screen frequency for monochromatic image of each color using the dependence of
This formula is more common case is known (see Bruises N. And. Manufacturing technology photomechanical printing plates, M. the Book of 1974, S. 79) mathematical expressions
0,0007 (2) where the distance between the centers of the printing raster elements;
b the distance from the observer's eye to the image.The normal distance vision is 250-300 mm When a=250x x0,007= 0,175 mm Last shows what should be the distance between the centers of adjacent raster (mnye studies show what is the distance between the raster elements will depend on the magnitude of the reflection coefficient of the dye, which is reproduced monochrome bitmap. The results allowed us to propose the dependence (1) as the formula for determining screen frequency for any paint.The formula shows that the more different the reflectance of the paint from the reflection coefficient of the drawing paper, the higher frequency it is necessary to reproduce the image of this paint and Vice versa.If in the formula (1) reflectance of paper to take per unit (a perfectly reflective paper), and the reflectance of the paint to be mistaken for the zero (completely black paint), the dependence (1) is transformed into the dependence (2). This suggests that the dependence (2) is a special case of formula (1).The drawing shows the curves reflect blue (1) purple (2) yellow (3) black (4) paints and drawing paper (5).P R I m m e R. First, the photometer FM-58 measured reflection coefficients of the drawing paper and dice printed on drawing paper cyan, Magenta, yellow and black colors. The thickness of the paint layer on each of the paint chosen is fficientow reflect these dice (see the drawing). Then on the measured values of the reflection coefficients using the dependence (1) determine the required frequency for each ink. It should be noted that the measurements are carried out relative to the drawing paper, i.e., below the left window photometer FM-58 instead of the standard white standard set of drawing paper. In the example used Finnish coated paper "Cubelet" weight 120 g/m2and paint series 2527. The measured reflection coefficients have the following values:b0,92;W0,51; p=0,42;g0,36;h0,14. Definition of line screens carry out the dependencies
For yellow paint
a 0,007 250 2,24=0,381 mm
Knowing the value and determine the l-line screen for yellow paint using the well-known equality a
l 26,24 l/cm
For purple paint
a 0,0007 250 1,84=0,322 mm
Knowing the value and determine l the frequency for Magenta
l 31 l/cm
For the blue paint
a 0,0007 250 1,58=0,278
Knowing the value and determine l the frequency for the blue paint
l 36 l/cm
For black paint
a 0,0007 250 1,18 0,207
Knowing the value, and determine l the frequency for black xperiment with 30 observers. They were given scales yellow, Magenta, cyan and black inks, made certain by the proposed method with line screens of 91.5% of the observers were registered, which is the normal distance vision (250 mm) scale all colors, made with the specified line are perceived as tone. This can be explained by the fact that, the smaller the contrast between the paper and ink (see the drawing), the rougher the frequency valid.After determining the line screens for each color synthesis is made separated svecokarelian photo forms for each ink with his ruling and accepted by the angle of rotation of the raster, for example, on Zitadelle zvetokorrekcia DS-350. Then make color-separation printing plates.Setting the printing form to the appropriate multi-color printing unit of the printing machine, for example, for offset printing, perform the printing multi-color reproduction.The proposed solution allows to improve the quality of multi-color reproduction, compared with the prototype due to objective and more precise definition screen frequency for each color on the dependencies. The WAY of GAINING the material layers of paint of different colors, bearing monochromatic images with different frequency, characterized in that, with the aim of improving the quality of reproduction, the frequency for each monochromatic image choose from
< / BR>where a pitch;
b the distance from the observer's eye to the image;
bthe reflectance of the printed material;
tothe reflection coefficient of the corresponding colors.
FIELD: image printing technologies.
SUBSTANCE: required color is produced by mixing colors of image points, and on substrate fluorescent point of printing paints image are formed, which contain pigments fluorescent when excited by a certain electromagnetic emission, and also non-fluorescent image points of printing paints, containing colored pigments, non-fluorescent when excited by a certain electromagnetic emission. Aforementioned fluorescent image points and non-fluorescent image points are positioned on substrate in staggered order relatively to each other.
EFFECT: higher efficiency, higher quality.
2 cl, 4 ex
FIELD: ornamental art.
SUBSTANCE: method consists in the multiple overlaying on the plane-stabilised stencil padding in the same place and then overlaying the printing material with creating the multilayer image on the padding; the intermediate layer drying between their overlaying; the finishing of the upper image layer with the alkyd based material. As a stencil, the computer image copy received from the ink-jet colour high-resolution printer is used. As a padding, the fabric is used which is preliminary two-sided tinted using the water emulsion acrylic lacquer with filling agent as a priming; dried at the room temperature; cut by seizes 3 cm less than the length and 1 cm less than the width of the album paper of the ink-jet printer, laid over the paper format until the upper and right margins coincide; and stuck to the said format with a tape, on the paper's left side. As the printing material, the priming based on the water emulsion acrylic lacquer with filling agent and the printing material of the ink-jet colour printer and overlaid not less than twice one by one, are used. The padding is orientated in space by receiving the first copy on it, with the marks for overlapping all subsequent copies at album localised sheet, avoiding shifting the copies relatively each other. For finishing the upper layer, the several layers of zapon lacquer is used with the intermediate drying.
EFFECT: allows producing articles which imitate artists' paintings made by brush and oil.
FIELD: printing industry.
SUBSTANCE: proposed solution discloses the method to select components of a printing system for optimal colour rendition, which consists in design of an original, assessment of its colour characteristics, selection of optimal components of the printing system, verification of compliance between a printing impression and an original image and run printing. At the same time the printing system is previously tested, and colour triangles are built. Assessment of colour characteristics of the original is carried out on the basis of an electronic copy of the original. Modelling of colour characteristics of the original and characteristics of the printing system is carried out in a uniform colour space. Printing system components are selected by comparison of original and printing system characteristics modelled in the uniform colour space. When detecting groups of elements arranged outside a colour triangle of the printing system, a combination of printing system components is selected, at which the vast majority of elements will be absorbed with a colour triangle of the printing system.
EFFECT: reduced capital intensity of printing system components selection providing for colour rendition without distortion and with optimal colour rendition.
FIELD: printing industry.
SUBSTANCE: proposed invention relates to a printing item comprising a substrate and a combination of printed inks including six colours. Each of colours is defined with a full tone and a half-tone of the specified colour, at the same time each ink has a value of colour difference dE of the combined full tone L-C-H-a-b, which is less than or equal to 2, and a value dE of the combined half-tone, which is less or equal to 3.
EFFECT: invention provides for production of printing items, which reproduce patterns with high accuracy.
7 cl, 1 dwg
SUBSTANCE: method of quality control of multicolour printing with primary colours is proposed. The method comprises: setting the range of values of colours on the printed material, at that the second primary colours are obtained by combining the primary colours with each other, and printing with successive superposition of the primary colours with the second primary colours according to the predetermined percentage to create the level of neutral-gray colour due to combination of the primary colours and second primary colours. In order to change the colour values for control of the colour change, the halftone of black "K" used as a reference level of the monochrome gray is compared with the level of the neutral gray colour in a predetermined range of colour values. Due to the use of the theory of balance of the neutral gray WING "K" Tone (WKTone) and visual technology the operators receive precise control of comparison of the colour ink consumption and precise control of change of the colour value, which can be read by the colour reading device for colour correction in real time.
EFFECT: technology can be used to improve the quality of obtaining the proofs of three primary colours and mass printing.
13 cl, 21 dwg
FIELD: printing industry.
SUBSTANCE: first, on the holographic paper or on the micro-embossed surface the optically transparent images with a refractive index of more than 1.7 throughout the visible light spectrum are printed with the sol-gel ink containing titanium dioxide nanocrystalline sol in ethyl alcohol solution in water after drying the noted sol-gel ink. Second, topographic paper or micro-embossed surface with the optical transparent images with a refractive index of more than 1.7 printed with sol-gel ink is covered with optically transparent polymer or lacquer with a refractive index of less than 1.6 with creating of the optical masking effect of holographic paper or micro-embossed surface areas free of images printed with sol gel ink and selective display of rainbow holographic images printed with sol-gel ink.
EFFECT: creation of a technologically simple, fast inkjet printing with conventional inkjet printers of unique and individual colorful rainbow holographic images, which do not fade under sunlight and UV-radiation.
9 cl, 8 dwg, 1 tbl
FIELD: printing industry.
SUBSTANCE: printed product with rainbow holographic images is characterized by the fact that it contains a protective layer of xerogel of nanocrystalline titanium dioxide, optically transparent in the visible range of the spectrum, with a refractive index of not less than 1.8, located on rainbow holographic images.
EFFECT: simplification of the technology of manufacturing printed products with protected iridescent holographic images and production of non-fading sunlight and UV-radiation of specified printed products.
15 cl, 9 dwg