1. Dialogue settings
The highlight part should be emphasized. The dot value of the extremely highlight part in the original can be set to 0, but the area of ​​the part set to 0 should not be too large. The second highlight can be set at 3% -5% of the ideas. In this way, the whiteness of the paper can be used to enhance the high brightness of the printed matter, so as to achieve the bright and bright effect.
The setting of the white field is very important for the scanning of the original. Too many dots will cause the highlight part of the print to become gray and not bright, resulting in insufficient contrast; if the area of ​​the extremely high gloss is too large (the area of ​​the screen is too large) Causes loss of highlight levels, coarse particles, etc. When setting the white point, according to the characteristics of the original, you can refer to the following points:
(1) For originals with normal exposure and standard density contrast, the extremely high-gloss part can be defined as the absolute screen.
(2) For overexposed, thin-densed originals, when setting the white field, the dot value of the extremely high-gloss part should be set at 3% -5% to deepen the level of the bright tone.
(3) For under-exposed, thick-density manuscripts, while the extremely high-gloss parts are classified as extinct, the mid-bright tone should be brightened to enrich the highlight and mid-bright tone levels.
2. Setting for black
Focus on the dark tone level. Generally, the black point setting is too small and cannot be set too large. Too small will cause the image to become gray, and too large will make the dark tone levels merge. Generally, the outlet value should be set at 95%. When setting the black point, it is very important to choose a point. Try to choose a neutral black part of a black object, and ensure the accuracy of the dot value setting.
When calibrating in the black field, it should be noted that the extremely dark parts of some manuscript dark parts are graded with the sub-black parts, and the layers cannot be pulled apart. At this time, if the deep black parts are to be fixed, the sub-black parts will also deepen , It is easy to cause the dark tone of the printed matter. Conversely, if the black field calibration takes into account the level of the second black part, the darkness of the extremely black part is insufficient, and it is difficult to balance both. To this end, we introduce a method to everyone, you may wish to try: turn on the transmission light to light on the back of the photo, and sometimes reveal the dark levels of the photo to fully reproduce it.
In addition, the selection of the gradation curve needs to be determined according to the tone, contrast, and density of the original, and it also needs to consider which gradation segment the image main body is in. Generally, in order to effectively reproduce the middle and dark tone levels, the tone curve of middle tone to brighten 5% and dark tone to brighten 10% can be used.
Now when some people in the industry deal with gray-scale manuscripts, in order to make the printed products look rich and the ink layer is heavy, they like to use two-color or four-color to copy the gray-scale manuscripts in the pre-plate making (common in high-end boutique printing). The most critical aspect of this replication method is the need to pay attention to the problem of neutral gray balance. Neutral gray balance processing is not good, it will cause the overall color of the image, so when adjusting the image, you need to pay attention to the change of the four-color dot value. In addition, in this process, the black version uses a tone skeleton curve. If a small point occurs at 50% of the c version, the middle tone level of the image is not enough and the three-dimensional impression is not strong. It is best to extend the starting point of the black version to The c version has small dots at 35% -40%, which can increase the middle and dark tone levels and three-dimensional sense of the image.
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