Method to select components of printing system for optimal colour rendition in multicolour printing

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.

8 dwg

 

The invention relates to printing processes and can be used in the manufacture of multi-color printing of reproductions in the conditions of small - and medium production printing production, for a variety of printing methods to predict the adequacy of color printing systems and the proper selection of the components of the printing system with the appropriate characteristics for optimal colour reproduction of the original for reproduction.

Colorimetrically identical transfer any of the original is provided automatically if its color is out of print coverage. Otherwise you have to modify the input signals, tying extreme color values of the original to the closest reproducible printing.

There are two basic approaches to the problem of selection of the components of the printing system based on the simulation of the imprint in a variety of ways. In the first case, selection of printing material is achieved by the simulated images using digital printing techniques on a tangible medium, which is controlled deflection characteristics of the final image from the parameters of the fine original [Yevtushenkov "Technology of processing of visual information" s-203]. Test the color by using digitally what about the printing equipment and material media. Evaluation of color deviation can be both visually and using a colorimetric equipment.

This approach has several drawbacks related to the fact that the equipment for digital proofing has a different color gamut with printing equipment offset, flexographic and other printing methods. This fact reduces the likelihood of an adequate assessment of colorimetric matching proofs of the drawing to print and, consequently, does not allow correct selection of components of the printing system to achieve the desired color quality edition print.

In the second case, the selection of components of the printing system is achieved by the simulation image on the drawing paper and using test equipment, appropriate technology application image simulated process [Yevtushenkov "Technology of processing of visual information" s-207]. This approach is closest to the development and provides the best matching color reproduction proofs reprint edition, however, contains a number of shortcomings related to the fact that the test equipment requires the manufacture of an additional set of printed forms. Evaluation of color deviation can be both visually and using a colorimetric equipment. Dan is the first technology is the most capital-intensive, as it requires additional test equipment, and costly in financial and time terms, and rarely used.

The technical result of the development is to reduce the capital intensity of selection components of the printing system for the transmission of color without distortion.

This result is achieved due to the fact that the method of selecting components of the printing system for optimal color reproduction when multi-color printing, which develop original, appreciate the color characteristics of the original, make the selection of optimal components of the printing system, verify that the print of the original and printing the copies, according to the present invention produce preliminary testing of the printing system and the building of bodies of color coverage, evaluate the color characteristics of the original for an electronic copy, simulate the color characteristics of the original and features of the printing system in equicontrasting color space and make the selection of the components of the printing system for the transmission of color on the printed without distortion by comparing the results of the simulated in equicontrasting color space characteristics of the original and printing systems, and in the case of groups of elements outside the body color is th coverage of the printing system, select the combination of components of the printing system, in which the vast majority of items will be absorbed by the body color gamut of the printing system.

Description of the drawings

The figure 1 presents the block diagram of the technological operations of the proposed method.

In figures 2, 3, 4 presents the body the color gamut of the printing systems with member material "Arctic", "Alaska", "Maule".

The figure 5 presents the original to play the printing system.

In figures 6, 7, 8 presents the simulated color characteristics of the original and printing systems with the use of the material "Arctic", "Alaska", "Maule".

At the first stage to estimate the color gamut of the print system (PS) is testing it using the rating scale color coverage. When you do this consistently tested used stamps printed materials and colorful compositions. Using photometric equipment (spectrophotometer) measure the coordinates of the color fields of the color guides. In the future gamut must be submitted in the form of a body in three-dimensional equicontrasting color space CIE L*a*b* [Domashev M.V., Hnatiuk S. p. Color, color management, color calculations and measurements. - SPb.: Peter 2009. - 224 S.].

The second stage is the evaluation of the color characteristics of the original (CHO). Definition what are the color coordinates of all the smallest of elements of the original image (pixels) in a colorimetric space sRGB and conversions to the coordinates of the color space CIE L*a*b*.

The third step is to display the body color gamut of the printing system (TCAPS) and elements of the reproduced image in the same color space CIE L*a*b*. When the occurrence of all elements of the image TCAPS the image will be reproduced by the printing system without distortion and compression common color contrast. When identifying groups of image elements outside TOPS, we can conclude about the number of picture elements and, respectively, and the image area, the color reproduction which will be executed with the distortion. However, it should be noted that if the image elements are located at a distance of less than 6,5% ΔΕ, this distortion will be unnoticeable for the standard observer.

To search for the components of the printing system that able to provide maximum colour accuracy, when printing allows the fourth stage. Of all tested combinations of components of the printing system selects the optimum combination in which the vast majority of items will be absorbed by TCAPS on the basis of economic and technological parameters of the materials (paper and ink).

A specific example of implementation

To implement this method, you must perform the several technological operations, described in the main text of this application:

1. to test the color gamut of the printed materials.

Equipment used:

Printing machine offset printing: Speedmaster 102-2

Dial: for controlling the color gamut of the

Spectrophotometer: GretagMacbet Spectro Eye

Was printed test scales on multiple types of printed materials. To reproduce the images were selected several common brands of cardboard (Arctic - 230 g/m2Alaska GC-2 - 230 g/m2, Maule RC - 225 g/m2)with different surface properties: surface roughness, white gloss and other properties that affect color.

With the help of a spectrophotometer operating in reflected light, were removed color coordinates field scale. On the basis of the data obtained were built body color gamut of the printing systems with a variety of printed materials, member (2, 3, 4).

2. The next step is to develop original and evaluate its color characteristics. Sample of the original presented in figure 5.

Technical characteristics of the original: "Cover"

Resolution: 3666×2519

Format (JPEG).jpg

due to the fact that the resolution is 3666×2519, the total number of values of color characteristics will be equal to the total number cell battery (included) is tov image - 9234654, therefore we will not present these data in tabular form.

3. The next step it is necessary to simulate the color characteristics of the original in equicontrasting color space. It also has body color gamut of the printing system, composed of printed test materials (6, 7, 8).

4. The next step you need to visually assess the availability of elements outside the body color coverage, these elements will play on this printed material with distortion.

To select components of a printing system which is capable of reproducing multi-color images without distortion of color choices, you must choose from the options presented tel-of-gamut that covers most of the image elements.

In this case, the best color gamut of the printing system is observed on the material mark Maule, as the smallest number of colors of image elements outside the body color gamut of the printing system that includes this material.

The developed method has the following advantages over the prototype:

does not require reproduction of the original on the printed material, as the color characteristics of fine image elements are removed from the electronic to the FDI of the original;

there is no need to use colorimetric equipment for evaluation of color differences between the original and the reprint;

modeling the color characteristics of the printing system and the original is in one equicontrasting color space, which reduces the forecast error;

allows you to not only predict the color with multi-color printing, but also allows the selection of components of the printing system, providing optimal color reproduction without distortion;

no additional test equipment to simulate the original drawing on paper;

technological stages, from the development of the original, are conducted using computers.

The selection of components of the printing system for optimal color reproduction when multi-color printing, consisting in the development of the original assessment the color characteristics of the original, the selection of optimal components of the printing system, the compliance print the original image and the print edition, characterized in that the produce preliminary testing of the printing system and the building of bodies of color coverage, and evaluating color characteristics of the original perform by e-copy of the original, modeling the color characteristics of the original and characteristics of p is the PCB of the system is performed in equicontrasting color space, and the selection of components of the printing system for the transmission of color on the printed without distortion, carried out by comparing simulated in equicontrasting color space characteristics of the original and the printing system, and upon detection of groups of elements outside the body color gamut of the printing system, select the combination of components of the printing system, in which the vast majority of items will be absorbed by the body color gamut of the printing system.



 

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EFFECT: invention makes it possible to improve quality of printing.

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