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A Method of Determining Optimal Printing Density

A technology of printing density and density, applied in the direction of instruments, specific gravity measurement, measurement devices, etc., can solve the problems of wasting materials and time, save materials and time waste, and improve production efficiency.

Active Publication Date: 2019-04-09
浙江高鼎彩印包装有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to determine the ink layer density value closest to the standard chromaticity requirement during printing, it is necessary to print a special test sheet, and a large number of measurements and calculations are required, which wastes materials and time

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] A method for determining the optimum printing density proposed by the present invention is to detect the cyan, magenta, yellow and black solid color patches in each ink area on the measurement and control strip in a scanning manner by adding a measurement and control strip to the printed sheet, and obtain the color patches of each color patch. Spectral reflectance value, calculate the main density value and tri-stimulus value, and get the relationship function between the main density value and tri-stimulus value of each color after fitting; then for the four colors of cyan, magenta, yellow and black, use The functional relationship between the tristimulus value and the main density, cyclically calculate the main density from 0.60, with 0.01 as the interval, until the tristimulus value and chromaticity value at 2.00, and then calculate t...

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Abstract

The invention discloses a method for determining optimal printing density. A control strip is added to a printed sheet, cyan, solferino, yellow and black on-site color lumps of ink regions on the control strip are detected in a scanning mode, spectral reflectance values of the color lumps are obtained, main density values and three stimulation values of each color lump are calculated, and a relation function between the main density value and the three stimulation values of each color is obtained through fitting; by means of the function relations between the three stimulation values and the main density value of the cyan color, the solferino color, the yellow color and the black color, the three stimulation values and chromatic values of each color are calculated circularly with the initial main density being 0.60 and the interval being 0.01 till the main density is 2.00, then color differences between the chromatic values and standard chromatic values are calculated, and when the chromatic value is minimum, the main density value is determined to be the optimal density value. The method solves the problems that in the prior art, a special printed sheet needs to be printed when the optimal ink amount is determined, and a lot of manual measurement and calculation are needed.

Description

technical field [0001] The invention relates to the technical field of quality detection and control in the printing process, in particular to a method for determining the optimum printing density during lithographic printing. Background technique [0002] In the previous printing production process, the customer provided the original manuscript, and the printing factory needed to complete the entire production process from pre-press production to post-press processing. With the digitalization of the pre-press production process, and the popularization of image processing software, computer typesetting software, etc., the current pre-press production work is often completed by advertising companies, publishing houses, newspaper offices and other units, or even customers themselves. The customer makes the digital file, and then goes to the printing company to output the printing plate and print it on the machine. Since a digital file processed before printing may be printed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N9/24
CPCG01N9/24
Inventor 余节约田培娟
Owner 浙江高鼎彩印包装有限公司
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