Scanning settings for grayscale originals
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Today, when color originals have been widely used, it is surprising that people will mention the copying of grayscale originals. In fact, in the current books, newspapers, magazines and even some high-end boutique printing, grayscale printing still has a place.
Many people think that the copying of grayscale originals is simpler than that of colored originals. In fact, in the process of copying, it is not an easy task to fully reflect the artistic effect of the grayscale manuscript and faithfully restore the manuscript.
When copying grayscale originals, pay special attention to the style and contrast of photography. First of all, we must grasp the light and dark contrast and contrast effect of the image as a whole, and then deal with the white of the bright tone, the gray of the middle tone, and the black of the dark tone.
Let's take a look at some of the settings for scanning a grayscale original.
1. Setting for white field
The highlight portion should be highlighted, and the dot value of the extremely high light portion in the original can be set to 0, but the area of the portion set to 0 should not be too large. The sub-highlight portion can be set at 3% to 5% of the point. In this way, the whiteness of the paper can be utilized to enhance the high brightness of the printed product, and the effect of high brightness and brilliance is achieved.
The setting of the white field is very important for the scanning of the original. If the number of dots is too large, the high-gloss portion of the printed product will be gray and not bright, resulting in insufficient contrast; if the extremely high light area is too large (the mesh area is too large), Cause high-level loss, coarse particles and so on. When setting the white field, according to the characteristics of the original, you can refer to the following points: (1) For the original with normal exposure and density contrast standard, the extremely high light part can be set as the absolute net. (2) For overexposed, thin-density originals, the value of the extremely high-light part of the screen should be set at 3%-5% when the white field is set to deepen the level of the bright tone. (3) For under-exposed, thick-density originals, while setting the extremely high-light part as the absolute net, it should brighten the middle and bright to enrich the highlight and medium-light levels.
2. Setting for black field
Focus on the dark level. Generally, the black field setting is too small and cannot be set too large. Too small will cause the image to be grayed out, and too large will make the dark level level. Generally, the dot value is set to 95%. When setting the black field, it is very important to select the point. Try to choose the neutral black part of the black object and ensure the accuracy of the setting of the dot value.
In the black field calibration, it should be noted that some of the dark parts of the dark part of the original are in parallel with the second black part, and the level cannot be opened. At this time, the dark part is deepened, and the black part is also deepened. It is easy to cause the darkness of the printed products to darken. On the other hand, if the black field calibration takes into account the level of the sub-black part, the darkness of the extremely black part is insufficient, and it is difficult to balance the two. To this end, we introduce a method to everyone, you may wish to try: open the transmissive light to light on the back of the photo, and sometimes the dark and medium tone of the photo is revealed, fully reproduced.
In addition, the selection of the gradation curve needs to be determined according to the gradation, contrast, and density of the original, and it is also necessary to consider which layer of the image body is in which segment. Generally, in order to effectively reproduce the middle and dark tone levels, a 5% curve can be used to highlight 5% and a dark tone to brighten 10%.
Nowadays, some people in the industry are dealing with grayscale originals. In order to make the printed products look rich in layers and heavy in the ink layer, they prefer to use two or four colors to copy grayscale originals in the early plate making (common in high-end prints). The most critical part of this method of replication 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 cast 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 kind of processing, the black version adopts the tone skeleton curve. If the C version is 50%, the image intermediate level is not enough, and the stereoscopic effect is not strong. It is better to extend the starting point of the black version to The C version has a small dot of 35%-40%, which can increase the middle and dark tone level and stereoscopic effect of the image.
In fact, to print a good print, the quality of the original is critical. In the above we discussed some parameters of the grayscale original calibration, but if there is no good original, there will be no fine prints, so we need to pay attention to the original. Carefully check the selected originals before production, and then strictly control the printing process in order to produce high-quality beautiful prints.