Digitalized Gray Balance Control Rule for Print Quality

Comparison of control methods and methods:

Because the method of controlling the number of screen lines is to compare the number of screen lines (85 to 200) to obtain a better quality, it is different from the method of calculating the better gray balance by using the color reproduction equation. The two cannot compare their merits and demerits, so I first compared the number of screen lines by comparing the quality of three-color overprint and four-color overprint, and then compare the three-color overprint and four-color overprint on each screen line. The number of pros and cons.

First, the screen line number control method:

Firstly, compare the advantages and disadvantages of three-color overprint and four-color overprint on different screen lines, and then compare the advantages and disadvantages of three-color overprint and four-color overprint on each screen.

Second, the comparison of the color reproduction equation:

Comparing a, the color correction equation b, the empirical equation c, the Nakke equation d, the modified Naclecule equation e, the n value corrects the accuracy and applicable range of the Nacob equation.

As the color reproduction of printing has moved toward the field of colorimetry and spectrophotometry, the practicality of the color correction equations and empirical equations based on concentration in the future is lower than that of the Runcob equation. The runkob equation is to find the neutral grey dot area to correspond to its concentration value, but there is one point that needs to be considered, that is, the problem of dot gain and dot shape, whether the subsequent study can be solved by the orcker equation. The error caused by the expansion of outlets.

Lu, conclusion

The gray balance control law is to be able to find the right amount of ink by different equations. Traditional print quality management requires data standards to control the stability of the copy. The early method was to establish a data-oriented concept by the combination of a gray balance and a copy of the guide, concentration meter, and empirical equations. With the development of colorimetry and spectrophotometry, the data standard is now established with the colorimeter and the modified n-valued Norbert equation. When the data standard is established, when the actual printing, the printer must pay attention to whether The required amount of ink can be printed stably, so that the printing quality can be improved. The runcock equation is to find the neutral gray dot area to correspond to its concentration value, so there are several points that need to be considered, that is, the dot enlargement and dot shape problem, so whether the equation can solve the error is very important.

The future printing trend "digital printing machine" should be very different from the traditional printing in its gray balance control method. The traditional printing is mainly to control the dot area to achieve the requirement of gray balance, and the printing method of the digital printing press is divided into editions. Printing and non-printing non-pressure printing, etc., may have different ways of controlling the gray balance, and whether the complex formula can be applied. Therefore, it is hoped that there will be research on related aspects of the color reproduction standard rule for digital printing in the future, and the application of the color reproduction formula in digital printing in the future.