RU1770156C - Test-object for four-color print process - Google Patents

Abstract

The invention relates to printing, and in particular to a test object, used for a four-color printing process according to the method of minimizing two color inks due to black. The purpose of the invention is to simplify a test object. The test object contains three test blocks (TB). Each TB is made in the form of a square, on two parallel sides of which there are identical rows (P) of fields (P) with a raster optical density (ROP) of 10 to 100% for black ink (ChK). On the other sides are the same P of the same color paint (CC) with a ROP of 10-100%. Each step of the Cheka is associated with a binary overlay of Cheka with another CC with a ROP of 5-60%. Each step of the first CK is paired with P binary overlay of the first CK with the third one having a ROP of 5-50%. Binary overlays form among themselves trospray-colored TB with the number P of each of them equal to the number of combinations of steps P of binary overlays. All P contain P with increasing stages of OP. 4 ill.

Description

The invention relates to printing, in particular to test objects used for a four-color printing process according to the method of minimizing three color inks due to black.

Known test object color gamut containing at least 13 blocks of test elements, where 3 blocks contain a floor of color paints and their binary combinations in an amount from 0 to 100%, determined by the value of the relative area of the raster elements on the raster transparencies, and the remaining blocks contain a half of combinations of purple and blue paint from 5 to 95% with the addition of yellow and black paint.

The disadvantage of this test object is its bulkiness and complexity, and hence the inconvenience in work when it comes to the equivalent of replacing three color inks with black.

The bulkiness of this test object can be judged even by the fact that each new gradation level of black ink will add as many blocks to the test object as how many gradation levels are taken with yellow paint.

The bulkiness of the known test object (TO) also leads to a significant consumption of paints and paper.

The purpose of the invention is to simplify maintenance, reduce the consumption of paints and paper, and increase ease of use.

This goal is achieved in that the TO contains three test blocks (TB). Each TB is made in the form of a square (K), on two parallel sides (DLS) of which there are identical rows of fields (ROPP) with a raster optical density (ROP) of 10 up to 100% for black ink (HK). On the other sides - identical rows (RR)

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one color paint (CC) with ROP from 10 to 100%. Each HK stage is associated with a binary overlay (BN) series of Cheka with another Central Committee with ROP from 5 to 50%. Each step of the first CK is associated with the BN row of the first CK with the third one having a ROL of 5 to 50% and BNs form tetra-colorful TBs with each other with the number of fields (P) equal to the number of combinations of steps (RFSS) of the BN row . All rows contain a floor with increasing ROP steps.

In addition, the TO contains three TBs, each of which is made in the form of K, according to the DPS of which the RORP with ROP is from 10 to 100% for ChK, and on the other sides - the RR of one Central Committee with ROP from 10 to 100%, and each step of the ChK it is paired with the BN CC group with a different CC with ROP from 5 to 50%, and each stage of the first CC is paired with the BN CC group of the first CC with a third one with ROP from 5 to 50%, and BN form tetro-painted TB with the number P of each of them RFChSS RB.

A positive effect is achieved by the fact that the combination of essential features (CSP) of ZTR provides all possible combinations of black and full of each color paint with the addition of all combinations of the number of two remaining incomplete color inks, which is due to the new relative arrangement of the parts of the TO device, which simplifies THEN, reducing ink and paper consumption and improving usability.

With a decrease in ROP of black and one leading CC less than 10%, the effect is visually invisible.

When two additional CKs in the BN decrease by less than 5%, the effect of adding the third and fourth inks to the print disappears, since with some paper grades the ROP raster elements of less than 5% are not reproduced.

With an increase in two additional CKs in the BN of more than 50% at the test object, we obtain excess flooring, since minimizing color inks by less than 50% is not economically feasible.

In FIG. 1-3 are block diagrams of the test object; in FIG. 4 is a diagram of a separate test block.

The test object includes three test blocks. In FIG. Figure 1 shows a test block for black ink and one color (1LQ leading; Fig. 2 is the same for another color ink (2C); Fig. 3 is the same for the third color ink (ZC).

The numbers indicate the boundary values of the steps of the raster optical density on the transparencies, and the arrows indicate the direction of the increase in the raster optical density. Each test block (for example, in Fig. 1) is made in the form of a square 1. On two sides 2 and 4 there are identical rows of fields of black paint. Two other

- 3 and 5 are the same rows of fields of the first color (leading) paint. In FIG. 4 shows the structure of each test block, where black paint is indicated - H, the first color (lead) - 1 C, for example,

0 purple - P, second (2C) complementary, for example yellow - F and a third complementary - ZC, blue - G. Black ink has K optical density levels, i.e. its range of variation is 41, 42

5 4J, ... Cheka, where 1-K.

Purple paint also has K steps of optical density, i.e. range her

the changes are P1, P2P, ..., PC,

where j 1-K. Yellow paint has A steps

0 optical density (from 5 to 50%), i.e. its range of variation is Ж1, Ж2

F ... F, where i 1-A. Blue paint has A levels of optical density (from 5 to 50%), i.e., its variation range is 5 et P. G2 P, ,,, GA, where i is 1-A. Every

a black ink step (e.g., P1) is coupled with a series of binary overlays of yellow and black paint (first field 41 + F1, last 41 + LCD). Matching fields 4j s

0 fields 4j + F occur along the BB line. Each stage of magenta paint (e.g. P1) is associated with a series of binary overlays of cyan and magenta (first field P1 + n, last P1 + GJ). 5 fields полей (with + + пол fields are mated along the C – C line. The binary overlays 4j + и and + + образ form four-colored test blocks. For example, the upper left block has the number of fields reflected by the following

0 fields (clockwise) П1 + П + 41 + Ж1-П1 + ГА + Ч1 + Ж1-П1 + ГА + Ч1 + ЖА - П1 + П + Ч1 n-ЖА. The number of fields of this, like any other four-color test block, is AxA elements.

5 The test object works as follows.

The test object is reproduced on paper using a four-color printing process under production conditions. Depending on the leading color of this color tone, one of the test blocks of the test object is selected. In this block, a field with the same color tone is determined and its coordinates are determined corresponding to the percentage ratio of raster elements on photoforms. For example, if the upper right field is selected (PC + GA + 41 + Zh1), then the ratio of raster elements is as follows: black paint-5%, yellow -5%; bluefish - 50%, purple - 100%.

Using the proposed technical solution, it is possible to significantly reduce the number of test object blocks in comparison with the prototype by changing the structure (mutual arrangement of the fields) and matching the colors in the test blocks, and shortening two of the three color inks in each of the three test blocks.

The number of fields in the test object is reduced by 4 times, which makes it possible to significantly simplify the test object and reduce the consumption of inks and paper for printing and increase usability. The economic effect of using the invention is 8-9 thousand rubles. for one medium edition (see conclusion), depending on the quality of the paper and the percentage of minimization of color inks due to black.

Claims (2)

SUMMARY OF THE INVENTION Test object for a four-color printing process, containing rows of fields with incremental steps of optical density for each color ink, their binary, triple overlay and overlay all four colors, characterized in that, in order to simplify the test object and increase the usability, it contains three test blocks, each of which made in the form of a square, on two parallel sides of which there are identical rows of fields of the raster structure with an optical density range of 10-100% for black ink, and on the rest to the sides are the same rows of fields of one colored ink of a raster structure with an optical density range of 10-100%, with each step of black ink being paired with a series of binary superposition of black with another color ink of a raster structure with an optical density range of 5-50%, and each the step of the first color ink is associated with a series of binary overlays of the first color with a third, having a raster structure with an optical density range of 5-50%, while the binary overlays form tetro-paint test blocks with the number of th each equal to the number of combinations levels of rows of binary overlays. iaa © Fig. { -2 hours yua 2. U, FIG. 2. g. 1770156 ZTs 100 Fi2.3