Brief analysis of color picture processing mode selection

In the typesetting process of newspapers or magazines, we often encounter the processing of color pictures. When a certain color picture is opened, it may be in RGB mode or CMYK mode. So when using Photoshop, do you use RGB mode or CMYK mode for color image processing? This article talks about the author's views on this issue.

In the process of using Photoshop to process pictures, you should first pay attention to that, for an opened picture, whether it is a CMYK mode picture or an RGB mode picture, do not switch between these two modes, let alone Go back and forth between the two modes. Because, in the bitmap image editing software, each time the color space of the image is converted, a part of the details of the original image will be lost. If you turn a picture into RGB mode in a while and CMYK mode in a while, the information loss of the picture will be great. What should be said here is that the picture mode used for plate-making printing in the publishing process of color newspapers must be a CMYK mode picture, otherwise printing will not be possible. But it is not to say that the printing effect of processing pictures in CMYK mode during picture processing must be very good, or it should be determined according to the situation. The effect of using Photoshop to select RGB mode for image processing is stronger than that of using CMYK mode. As long as the image is processed in RGB mode, and then converted into a CMYK mode image, the output film can be processed for printing.

In the process of picture processing, if the picture opened for processing is itself a picture in RGB mode, or the original picture is allowed to be scanned in RGB mode during the input process of the scanner, this situation is no better for the layout of the color newspaper. Too. When using Photoshop to scan the original picture, as long as you select the RGB setting option in the color setting option in the file menu bar, the color picture input through the scanner is the RGB mode picture. In short, if you do n’t need to convert the picture mode first, you can get the RGB mode pictures, and use this mode to process the pictures, especially the pictures downloaded from the Internet. To ensure the printing effect of the pictures, you must Use RGB mode for processing. The following aspects can explain this point.

(1) RGB mode is the color method adopted by all devices based on optical principles. For example, the display works in RGB mode. The color range of the RGB mode is larger than that of the CMYK mode. Therefore, the RGB mode can express many colors, especially bright and bright colors (of course, the colors of the monitor must be corrected so that the color of the picture will not be distorted). This color is difficult to print when printing. This is also the main reason why the picture becomes darker when the color mode of the picture is converted from RGB to CMYK. When editing RGB mode pictures in Photoshop, you must first select the CMYKPreview command in the View menu (if the Photoshop used is the Chinese version, select the viewing option in the bright picture menu bar and select the CMYK option), also That is to say, editing and processing pictures in RGB mode, and displaying pictures in CMYK mode, so that the color of the picture on the display screen seen by the operator is actually the color required during printing. This is very important. When applied to printing This is a good picture processing method. When Photoshop works in CMYK mode, there is one more color channel than RGB. In addition, it also uses RGB display to simulate the display effect of CMYK, and the calculation method of CMYK is completely different from the optical-based TGB principle. Therefore, The efficiency of processing pictures in CMYK mode is lower, and the quality of processing pictures is also worse.

(2) When using Photoshop to process pictures, some filters in Photoshop do not support CMYK mode. In addition, the picture editing process often goes through many subtle processes. For example, it may be necessary to combine the contents of several pictures. Since the original tone of each component cannot be the same, they need to be adjusted. Parts are synthesized in a certain way and processed with filters, etc.

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