Processing newspaper pictures with photoshop
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Pictures play an important role in the newspaper layout. If used properly, it can not only beautify the layout, increase people's interest in reading, but also play a finishing touch. The processing of a picture before printing directly affects the effect after printing. Therefore, through years of practice, we have made some useful explorations on image processing.
Before scanning a picture, you should first review it. For the quality of the picture, it should be done in mind, that is, whether the exposure of the picture is excessive or insufficient, and it is not necessary to go to the network, 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 the least.
Normal pictures are scanned in color. If it is a grayscale image, it will be better to use a color scan. The grayscale image converted from color is more layered than the grayscale image scanned directly, especially for colors with a saturation of 70% or more. There is a “dash” option on the LinoColorElite setting panel in Chinese. If it is a print, you need to select the value here. The higher the printing accuracy, the larger the number of pictures to be selected. In addition, 6 options such as “color calibration” can be selected as default, and can be selected according to your own situation. The “Color Assistant” in “Calibration” is a very useful tool. Choose different methods for the picture, or freely determine the selected value. Adjusting the data during the image scanning process will retain more layers and details.
In Photoshop processing images, you must first determine the black and white field and gray balance of the image. These two factors are very important and necessary. The determination of the black and white field is not the same according to different printing needs. But the standard is that the black field can't be ruined. However, in order to ensure that the visual effect of the picture is better after printing, a small area of the net or paste can be considered, but it must not be a large area. If the picture is distorted, we can restore its color by gray balance, but the moderate gray affects the color of the whole picture, so it should be accurate when used. The mastery of gray balance has the following experience, that is, below 20% or above 80%, the CMY value is basically equal; 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 convert a color image into a grayscale image: directly convert it with the "mode" function; or convert the color image to Lab mode first, then delete "a channel" and "b channel", and finally convert the image into "Grayscale". In the chroma Lab mode conversion, the luminance L channel retains more layer changes, so the effect will be better. After the grayscale picture is fixed in the black and white field, it is necessary to pay attention to the level of the picture. The middle tone must be opened. Otherwise, the picture will have a foggy feeling, dirty and unclear, and the contrast of the middle tone will increase, which will obviously improve. This situation.
In the process of using Photoshop to process images, don't let the images turn around in both modes. Because each time a conversion is made, part of the original picture details will be lost. When converting an RGB mode picture into a CMYK mode picture, the color separation parameter will play a decisive role in the effect of the picture conversion. The adjustment of the color separation parameters will greatly affect the conversion of the picture. Photoshop image processing software has the ability to control the color separation parameters. That is to say, when it is necessary to convert the image processed in RGB mode into CMYK mode for output, the adjustment of the color separation parameter can be lightened in the picture during the conversion process. Color loss during mode conversion.
If you convert an RGB mode picture to CMYK mode, add an intermediate step to the operation step, that is, first convert to Lab mode. The Lab mode consists of three channels, the L channel represents brightness, which controls the brightness and contrast of the picture, and the a channel includes colors from dark green (low brightness value) to gray (middle brightness value) to bright pink (high brightness value). The b channel includes colors ranging from bright blue (low luminance value) to gray to focal yellow (high luminance value).
The Lab mode is similar to the RGB mode, and the blending of colors produces a brighter color. Only the value of the luminance channel affects the light and dark variations of the color. The Lab mode can be thought of as a mode of two channels of RGB mode plus one brightness channel. Lab mode is device-independent and can be used to edit any image (including grayscale images) in this mode, as fast as RGB mode, and several times faster than CMYK mode. Lab mode ensures that there is no loss of color in the CMYK range when performing color mode conversion.
Processing images in different modes will have different effects. Lab mode is helpful for increasing the contrast of the image, but the amplitude is not too large, otherwise the image will be distorted. RGB is the best mode for processing pictures, providing photos with saturation and brightness, performance levels and other functions are very good, especially good at adjusting people's facial color, without causing distortion or loss of level. Only all pictures are converted to CMYK mode before printing, so there is an advantage in adjusting the picture in CMYK mode. In this mode, each color can be adjusted through the channel to prevent the color cast of the picture, which is convenient for determining the black and white field.
Different pictures require different processing methods. Pictures like Chinese paintings must be faithful to the original film, and the color cannot be changed because the effect is good. Pictures such as comics and calligraphy can be considered with bitmaps in order to ensure that its details are not lost. This is clear and the image capacity is small, which will increase the speed of the hairline.
In addition, Photoshop has a lot of useful tools in "Image One Adjustment", such as "Brightness/Contrast", "Hue/Saturation", "Optional Color", etc. In actual work, as long as it is used reasonably, it will get very good. effect.