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Ink color evaluation method for newspaper printing

An evaluation method, ink color technology, applied in image data processing, instruments, calculations, etc., can solve the problems of low efficiency of ink color measurement, inaccurate subjective evaluation, etc.

Active Publication Date: 2019-07-16
杭州电子科技大学上虞科学与工程研究院有限公司 +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a new ink color evaluation method for newspaper printing, to solve the inaccurate problem of relying on human eyes for subjective evaluation of ink color, and the low efficiency problem of using color measuring instruments to measure ink color

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  • Ink color evaluation method for newspaper printing
  • Ink color evaluation method for newspaper printing
  • Ink color evaluation method for newspaper printing

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Embodiment Construction

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0051] like figure 1 Shown, the ink color evaluation method of the newspaper printing of the embodiment of the present invention specifically comprises the following steps:

[0052] Design newspaper printing measurement and control strips, arrange cyan, magenta, yellow, and black solid color blocks in order from left to right, and each color block is a 2.5mm square. From the printed newspapers with measurement and control strips, use color measuring instruments, such as eXact or 528 spectrophotometers produced by X-Rite, to measure and select L * a * b * The cyan, magenta, yellow and black icons whose value is close to the requirements of newspaper printing standards, record their density value, XYZ value, L * a * b * value, and then cut a square with a side length of 2.5mm along the edge of the color block. In the same way, after measu...

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Abstract

The invention relates to the field of newspaper printing production, in particular to an ink color evaluation method for newspaper printing, which comprises the following steps: connecting a camera ofa mobile terminal with a magnifying lens; calling a photographing function of the mobile terminal, and setting a plurality of viewfinder frames on a photographing preview screen so as to be respectively aligned with the sample icon and the tested color block on the magnifying lens base; carrying out subjective evaluation by utilizing the amplified sample icon and the tested color block which arepresented on the screen side by side; and obtaining RGB values in the viewfinder frames, and calculating the color feature values of the tested color lumps by combining the known color feature valuesof the sample icons so as to carry out objective evaluation. According to the method, visual evaluation and quantitative detection are combined, the sensitivity of visual evaluation is improved, meanwhile, color quantitative information can be rapidly given, and the method is suitable for quality evaluation and control in the newspaper printing production process.

Description

technical field [0001] The invention relates to the field of newspaper printing production, in particular to an ink color evaluation method for newspaper printing. Background technique [0002] In order to obtain high-quality newspaper printing effects, it is necessary to control the solid ink color and dot gain of the four colors of cyan, magenta, yellow, and black during printing. Since the dot gain is relatively stable, the ink color is more likely to fluctuate with the change of the ink volume. Therefore, it is more necessary to evaluate the ink color frequently in production, and adjust the ink volume according to the evaluation results. In addition to the solid ink colors of cyan, magenta, yellow, and black, newspaper printing also needs to focus on the header ink color. The methods of ink color evaluation mainly include subjective evaluation and objective evaluation. The subjective evaluation method is generally to print a measurement and control strip containing cy...

Claims

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Application Information

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IPC IPC(8): G06T7/90
CPCG06T2207/30144G06T7/90
Inventor 余节约田培娟
Owner 杭州电子科技大学上虞科学与工程研究院有限公司
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