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In these two sets of inks, magenta and magenta are the main differences. In some red-based screens, as well as skin color and large red areas, two different situations will occur: printing with magenta will show a vivid red color, while in the skin tone area, it will not be a little more or less than magenta. One point will be particularly sensitive to reflect; and when using a set of ink magenta, the magenta curve will exist in the neutral balance curve slightly higher than the yellow curve.
The difference between medium yellow and transparent yellow ink is that the hiding power of yellow ink is weak. Therefore, when the use of translucent yellow on the last color overprint, the performance of the color is favorable, but also in line with the four-color machine's printing color sequence.
When using different inks for printing, it will be different when the same dot area forms a color, so the neutral gray balance will also bring difficulties to scan quality and data. For this reason, in the general case, the proofing job always uses a fixed set of ink, and it will never change the brand and model of the proofing ink.
At the same time, the ink in the process of color formation will also affect the normal performance of the print color due to its purity. The main reason that affects the purity of the ink in the proofing process is that during the process of changing the color of the proofer, the ink roller cleaning is not clean, so that the hue of the ink is affected by the residual ink of the previous color. Therefore, it is very necessary to maintain the original hue and purity of the ink during the operation. The use of a reflection densitometer to determine the relevant data for the ink is an effective way to control the hue of the ink. The density of R, G, and B reflection color densitometers is used to determine the density of the other two colors of pure ink at the standard proof density. In fact, the color error of the ink is calculated based on the data obtained from three different color filters of one color ink. , grayscale and color efficiency. However, during the actual operation, in order to facilitate the operation, the hue purity of the ink can be controlled by controlling the minimum density of two of the color filters. In the determination of cyan ink using G, B filter; measurement of yellow ink using R, G filter; magenta ink when used B, R filter.
Simulation proofing is a special technique in the prepress area that simulates the printing process and requires a certain amount of empirical operation. In particular, the proofer is manually added to the amount of ink and the amount of water is adjusted. The adjustment of the printing pressure of the proofer needs to be performed by an experienced operator. At the same time, in the proofing process, it is necessary to use reflection densitometers and high power magnifiers to control the ink density and dot quality to ensure the stability and accuracy of the proofs. The above table shows the disadvantages and reasons that arise during the proofing process.
The hue and purity of proofing ink
The hue of the ink is directly related to neutral gray balance and color formation. At present, the four-color version of quick-drying inks for lithography in China can be roughly divided into two sets of standards: one for yellow, magenta, sky blue and black; the other for yellow, magenta, sky blue and black.