How to deal with landscape originals in prepress production
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There is a class of originals used in printed manuscripts - landscape-type manuscripts. Generally, this type of manuscript requires a strong contrast of color, light and darkness, a higher color saturation, a longer tone, and a black version that is not too long, so that the printed matter is good.
For the color separation of landscape-like manuscripts, the black version only serves as a contour. Usually, the middle tone and the dark tone part are heavier, and the level of this part is expressed, and the main color is through the cyan, magenta, and yellow plates. appeared. The general normal landscape manuscript mainly emphasizes the focus on the bright tone and the middle tone, and requires the saturation of the color. Therefore, when making the landscape manuscript, we can sacrifice a part of the dark tone level properly, and make the middle light layer rich in color. Bright. Another important aspect of dealing with landscape manuscripts is clarity. When making, you need to add some sharpening to strengthen the small changes of the object to make the scene clear.
Some landscape manuscripts are mainly color, which requires the color and contrast of the colors. In the landscape manuscript, generally for the processing of the sky, I hope the sky will appear blue, the yellow version of the composition should be as small as possible, the black version should not have a dot, the main color version is the green version, especially the clear sky. For the treatment of the grass in the manuscript, note that the main color version of the grass is blue and yellow, the yellow version is generally larger than the green version, and the yellow version is determined according to the season. Generally, the spring grass is tender green, then yellow. The version of the Daqing version is more, up to 50% to 60%. When the grass reaches the end of summer, the green becomes darker. The gap between the green version and the yellow version becomes smaller, about 20%, and the magenta version has certain outlets. .
It is also important to observe the shooting of the original when dealing with landscape originals. The method of processing is different for originals in different situations. Below we analyze the three different situations.
1. Overexposed manuscript
The characteristics of this type of manuscript are that the main body of the image is concentrated in the bright and medium bright parts, the dark tone level is small, the density is small, the contrast is not enough, and the color saturation is insufficient, and the image looks white and bright.
When dealing with such manuscripts, it is necessary to pay attention to the processing of midtones and midtones. The density of the midtones should be increased, which improves the contrast of the image and enriches the level. The saturation of the color will also correspond. Improved.
2. Underexposed manuscript
The characteristic of this type of manuscript is that the main body of the image is concentrated in the middle and dark tone and the dark tone part, the whole is dark, the density is too thick, and the dark tone is more powerful.
For the processing of this type of manuscript, it is necessary to brighten the image as a whole, reduce the density of the midtones in the middle adjustment, and reduce the middle adjustment part to enrich the middle and bright tone levels. In the adjustment process, it is necessary to pay attention to the changes of the highlights. Be careful not to make the area of the net part too large.
3. Normally exposed original
This type of original image has a normal level, large contrast, good color saturation, and vivid colors, making it an ideal manuscript. When processing, normal calibration can be done, you need to pay attention to the sharpening process, do some edge sharpening, or do some Unsharp Mask, enrich the subtle level of the image.
In fact, to deal with landscape-like manuscripts and other types of manuscripts, you need to pay attention to the setting of black-and-white field points and the control of gray balance. Generally, according to the characteristics of landscape manuscripts, the percentage of dot points in white field is: C version 3%, M version 2%, Y version 2%, K version 0%; black field dot percentage: C version 95%, M version 90 %, Y version 90%, K version 85%.
The black and white field is set correctly, and normal contrast can be obtained; the gray balance can be controlled to avoid color shift. These two points are very important for image processing. Only by doing these two things can you get a good image.