Analyze the original color: Toning is performed on the original color sample. In order to increase the blindness of the toning, the original color must be analyzed first to determine the hue and proportion of the original ink. The analysis of the original manuscript assumes that the color measurement by the instrument and the color comparison of the human eye are used. The use of printing chromatography to determine the proportion of the three primary inks is relatively simple and easy to use. You can calculate the content of the three primary inks and white inks based on the percentage of the primary color dots marked in the chromatography.
Color matching: According to the calculated matching ratio, first weigh a small amount of primary color ink for distribution. Pay attention to the comparison between the ink color and the original color from time to time. When the two colors are close to each other, you can use the ink to compare the ink on the sample paper and repeat the same until the two colors are completely the same. During color comparison, the ink should be uniform, and the thinner the ink layer, the better. In order to ensure the accuracy of the color sample hue, the paper should be the same as the paper used in printing. Brightness and saturation are adjusted by adding white and black ink. When you need to participate in white and black ink, you should pay special attention to the accuracy of weighing.
After the inks dispatched reach the original requirements, batch inks can be dispensed in proportion. The amount of ink used in a batch of jobs is determined by the type and specification of the paper, the area of the image, the number of impressions, and the amount of wastage, and it is based on the principle of more or less.
Record: After the preparation is complete, the information of the proportion of each color ink used for ink adjustment, ink adjustment oil, dry oil, ink model, quantity, and manufacturer will be published in detail, and it will be used as a reference when the ink is dispensed later.
Other painful items: When analyzing originals and color comparisons, it is best to perform it under a standard light source or a light source close to daylight, and also pay attention to the color comparison after the ink film is monotonic to increase visual errors. Try to use colors that are close to the primary color ink or other single-color inks. Use too many color inks, the worse the brightness and saturation, and then affect the printing results. Therefore, the less the number of inks is, the better the color matching is. It is best to choose the ink products of the same manufacturer.
In the process of color adjustment, we must fully query the daily printing speed and printing pressure of our equipment, and control the ink viscosity. The shades of the printed products under different printing speeds and pressures will be different. Therefore, the ink assigned at low speed must be checked with the original after the printing speed reaches the normal speed, so as not to have color difference and constitute a throw. .
After the ink is tuned out, it is assumed that errors between the color samples printed on the machine and the original should be corrected in time. When changing the color, the ink fountain and the ink roller should be cleaned to avoid uncleanness and color cast. The spot inks remaining after printing can still be assigned according to the hue of the new manuscript, but the saturation is often grayish. The remaining inks that are retrieved from the ink fountains can be emulsified or have good printability change.