Pictures play a very important role in the layout of newspapers. If used properly, they can not only beautify the layout, increase people's interest in reading, but also serve as the finishing touch. The processing of a picture before printing directly affects the effect after printing. Therefore, through years of practice, we have conducted some useful explorations of image processing.
Before scanning the picture, you should first review the picture. You should know the quality of the picture, that is, whether the exposure of the picture is excessive or insufficient, whether you need to go to the network, etc., so that the picture can be properly processed during the scanning process, because the picture is processed during the scanning process, The level of loss is minimal.
Generally pictures are scanned in color. If it is a grayscale image, the effect of using color scanning will be better. The grayscale image converted by color is more layered than the grayscale image of direct scanning, especially on colors with saturation above 70%. There is a "Strike" option on the finished Lino Color Elite setting panel. If it is a printed product, you need to select the value here. The higher the printing accuracy, the larger the number of pictures. In addition, "Color Calibration" and other 6 options can be selected by default, and can be selected according to your own situation. The "Color Assistant" in "Calibration" is a very useful tool. You can choose different methods for the pictures, or freely determine the selected values, and adjust the data during the picture scanning process, which will retain more levels and details.
In the processing of pictures in Photoshop, first of all, the black and white field and gray balance of the picture must be determined. These two factors are very important and necessary. According to different printing needs, the determination of the black and white field is different. But the standard is that the black field can't confuse the white field and can't stop the net. However, in order to ensure a better visual effect after printing, you can consider a small area of ​​the screen or paste, but it must not be a large area. If the picture is distorted, we can restore its color through gray balance, but moderate gray affects the color of the entire picture, so it must be accurate when used. There are several experiences in mastering gray balance, that is, below 20% or above 80%, the CMY value is basically equivalent; in the middle value part, the MY value is basically equivalent, but the C value is 10% to 15% more than the MY value.
In actual operation, the processing of grayscale images will be relatively simple. There are two ways to exchange color images into grayscale images: directly use the "mode" function to convert; or first convert the color image to Lab mode, then delete the "a channel" and "b channel", and finally convert the image into & "Grayscale". In the chroma Lab mode conversion, the luma L channel retains more gradation changes, so the effect will be better. After setting the gray-scale picture in the black and white field, pay attention to the level of the picture. The middle tone must be pulled apart, otherwise the picture will be foggy, dirty and unclear. Increase the contrast of the middle tone and it will be significantly improved. This situation.
In the process of using Photoshop to process pictures, don't let the pictures go around in two modes. Because every time a conversion is performed, a part of the details of the original picture will be lost. When converting RGB mode pictures into CMYK mode pictures, the color separation parameters will play a decisive role in the effect of the picture conversion. The adjustment of color separation parameters will greatly affect the conversion of pictures. Photoshop image processing software has the ability to control the color separation parameters, that is to say, when it is necessary to convert the RGB processed image to the CMYK mode for output, the adjustment of the color separation parameter during the conversion process can be reduced in the picture. Colors are lost during mode conversion.
If you convert the RGB mode picture to CMYK mode, add an intermediate step to the operation step, that is, convert to Lab mode first. The Lab mode consists of three channels. The L channel represents brightness, which controls the brightness and contrast of the picture. The colors included in the a channel range from dark green (low brightness value) to gray (medium brightness value) to bright pink (high brightness value) , The b channel includes colors from bright blue (low brightness value) to gray to burnt yellow (high brightness value).
Lab mode is similar to RGB mode, the mixing of colors will produce brighter colors. Only the value of the brightness channel affects the change of color. You can think of the Lab mode as a two-channel RGB mode plus a brightness channel. Lab mode is device-independent. You can use this mode to edit and process any picture (including grayscale pictures), and it is as fast as RGB mode and several times faster than CMYK mode. Lab mode can ensure that the colors in the CMYK range are not lost when the color mode is converted.
Processing images in different modes will have different effects. For example, Lab mode is very helpful to increase the contrast of the image, but the amplitude should not be too large, otherwise the image will be distorted. RGB is the best mode for processing pictures. It provides functions such as saturation and brightness of photos, and expression levels. It is particularly good at adjusting people's facial colors without causing distortion or loss of levels. It is just that all pictures must be converted to CMYK mode before printing, so it is advantageous to adjust the picture in CMYK mode. In this mode, adjusting each color through the channel can prevent the picture from being color cast and is also convenient for determining the black and white field.
Different pictures need different processing methods. Pictures like Chinese paintings must be faithful to the original film, and its color cannot be changed because of the good effect. In order to ensure that its details are not lost, pictures such as comics and calligraphy can be considered bitmaps, which are clear and have a small picture capacity, which will increase the speed of the layout.
In addition, there are many practical tools in Photoshop "Image Adjustment 1", such as "Brightness / Contrast", "Hue / Saturation", "Optional Color" and so on. effect.
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