A method for measuring ink color of newspaper printed text
A detection method and newspaper technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of lack of quantitative data, difficulty in guaranteeing the quality of text ink printing, etc.
Active Publication Date: 2016-03-02
绍兴市绿箭彩印有限公司
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Problems solved by technology
In the newspaper printing production site, the ink color is mainly controlled by the visual inspection of the printing workers. Without quantitative data, it is difficult to guarantee the printing quality of the ink color of the Chinese characters in the newspaper.
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[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0032] Newspapers are generally printed on newspaper rotary offset presses, and the receiving part of the printing machine has the functions of folding and cutting. During the printing process, printing workers take sample sheets, mainly rely on visual perception to evaluate the depth of ink color, and then adjust the output ink volume of the ink fountain of the printing machine to control it.
[0033] Such as figure 1 Shown, the measuring method of the ink color of a kind of newspaper printing that the present invention proposes, this method may further comprise the steps:
[0034] Step (1) Prepare a newspaper, which needs to have a black solid color block that exceeds the area of a single measurement of the densitometer and a single shot of the photomicrograph. Then if figure 2 As shown, connect the USB digital photomicrograph to the c...
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The invention discloses a measuring method for a newspaper printing character ink color. A conventional densimeter measuring method has great error and inconvenient operation, and a measured value is inconvenient for direct guidance of workers to produce. The method comprises the steps: firstly utilizing a photomicrography instrument to shoot a blank part and a black solid color block part on newspaper, acquiring pixel average values of the two parts after correction, and calculating commonly used logarithmic values; then measuring the densities of the blank part and the black solid color block part, and building a linear relationship by utilizing the commonly used logarithmic values and the density values of the two parts; followed by shooting a character part by the photomicrography instrument, and calculating a pixel average value of locations of strokes; and then calculating a density value of the stroke part according to the linear relationship. The method solves the problem that the stroke density cannot be measured directly by a densimeter; and the method utilizes the image processing method to correct the error caused by the shooting process, and has high detection precision.
Description
technical field [0001] The invention relates to the technical field of printing quality detection, in particular to a method for measuring ink color depth of characters during newspaper printing. Background technique [0002] Newspapers, books and other publications with text as the main content, the depth of the ink color of the text will affect the reading effect. If the ink color is lighter, the contrast between the graphic and the background color of the paper is small, and the text is not clear enough; An important indicator of printing quality requires a method for detecting the ink color of newspaper printed matter. The conventional detection method of ink color is to use a densitometer to measure, and the densitometer calculates the density value according to the average reflectance of the measured area. This method requires a color patch in the area to be inspected that is uniform in color and whose area is larger than the measuring aperture of the densitometer. ...
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IPC IPC(8): G01N21/25
Inventor 余节约田培娟
Owner 绍兴市绿箭彩印有限公司