The two-color printing brush design simply refers to a business card printing process in which an image is reproduced by a color separation processing technique using a combination of two different color inks. In general, in the four-color plates of C, M, Y, and K, the black (K) plate is combined with any other three-color (C, M, Y) plates, because the black plate is in the dark tone. The information distribution is strong and can enhance the contrast of the image tones. In the bright tone, the black tone information is weakened, and the C, M, and Y colors have stronger color levels, which can superimpose the image layer change and color change, and it is easier to reproduce the original color level and order of the image. Tune information. The combination of the three colors C, M, and Y, although the color range is large at the bright tone, lacks image hierarchy in the dark tone, resulting in a small color tone contrast, and it is difficult to reproduce the original effect of the image. Therefore, the two-color printing design mostly refers to the combination of black and other spot colors.
For the two-color printing design, the key is to make the two-color processing of the image. On the basis of fully protecting the original level and tone information of the image, the best coloring effect can be achieved by changing the relationship of the two-color combination to achieve the desired color effect. It is a duotone in Photoshop image processing software. Duotone is the effect of the graphic designer's desired image by adjusting the curves of two different colors. That is to say, the two-color printing design is not a direct reduction of the four colors C, M, Y, K (minus two channels, retaining two channels), but based on the structural principle of the gray mode image itself. Adjust the two colors with the Curve tool and recolor the combination at different levels.
    The correct way is:
1. Make sure the original image is in RGB mode. Rather than the CMYK mode (because the RGB mode is based on the optical principle, the CMYK mode is determined by the absorption characteristics of the paper ink, so the RGB mode has a larger color range than the CMYK mode. The RGB mode can represent many colors, especially Bright and bright colors. That is to say, RGB mode can reflect richer image level and tone information than CMYK mode).
2. Then change the RGB mode to Lab mode, delete the two color channels a and b, and only keep the L brightness channel. Then convert the L-bright channel mode to the Grayscale grayscale mode (because the Lab mode has good characteristics, it contains the widest range of colors, making up for the lack of RGB and CMYK color modes. That is, the image is transformed by Lab mode. The grayscale mode is more versatile than the RGB and CMYK grayscale modes, which preserves the tone information of the original image more comprehensively).
3. The gray-scale image is double-g1lh2jg color design using the two-tone tool. In the process of using the two-tone tool, you can adjust the two-color curve to achieve the ideal two-color effect according to your own design needs. Then store the two-color design file as PhotoshopEPS file format. In this way, the color separation task of the two-color printing design image is completed, because the technique of the two-color printing design lies in the two-color design of the image.
There are some graphic designers who are not well versed in the principles of printing technology and are not proficient in the performance of Photoshop software. So the wrong approach is often used for two-color printing designs. There are two main forms:
First, directly select the image components of two corresponding channels in the four color channels C, M, Y, and K, or select two channels with rich image layers to output the plate making. This method only uses the partial tone information of the image one-sidedly and sacrifices the hierarchical information of other channels, which inevitably leads to image distortion.
Second, in order to enhance the tone information of some channels, first convert the CMYK mode of the image into the Grayscale gray mode, that is, merge the four color channels into a monochrome channel, then switch back to the CMYK four-color mode, and finally select two. Corresponding to the image component of the channel, output plate making. Compared with method one, although this method improves the level of images in some channels, it still loses more layer information of other channels and causes image distortion.
The basic elements of layout design are composed of images, vector characters, decorative lines, and color blocks. This requires that images that have been designed in two colors must be combined with their corresponding explanatory text, and the text, decorative lines, and The color of the color block is defined by its own palette, so the key to two-color printing design skills is:
Photoshop image two colors imported in the group software (such as Pagemaker, Freehand, etc.) must be used as the two-color used in the group software. For example, the color of a certain image after the design of the Photoshop two-tone tool is black and PANTONE1915. When the image is placed in the page maker Pagemaker, the image will be automatically brought into the color palette of the Pagemaker software. Two spot colors black and PANTONE1915, when defining text, decoration lines and color block colors in Pagemaker software, you must only use black and PANTONE1915 two spot colors, so as to ensure that the book's later output plate making is two-color.
For the two-color printing design, the key is to make the two-color processing of the image. On the basis of fully protecting the original level and tone information of the image, the best coloring effect can be achieved by changing the relationship of the two-color combination to achieve the desired color effect. It is a duotone in Photoshop image processing software. Duotone is the effect of the graphic designer's desired image by adjusting the curves of two different colors. That is to say, the two-color printing design is not a direct reduction of the four colors C, M, Y, K (minus two channels, retaining two channels), but based on the structural principle of the gray mode image itself. Adjust the two colors with the Curve tool and recolor the combination at different levels.
    The correct way is:
1. Make sure the original image is in RGB mode. Rather than the CMYK mode (because the RGB mode is based on the optical principle, the CMYK mode is determined by the absorption characteristics of the paper ink, so the RGB mode has a larger color range than the CMYK mode. The RGB mode can represent many colors, especially Bright and bright colors. That is to say, RGB mode can reflect richer image level and tone information than CMYK mode).
2. Then change the RGB mode to Lab mode, delete the two color channels a and b, and only keep the L brightness channel. Then convert the L-bright channel mode to the Grayscale grayscale mode (because the Lab mode has good characteristics, it contains the widest range of colors, making up for the lack of RGB and CMYK color modes. That is, the image is transformed by Lab mode. The grayscale mode is more versatile than the RGB and CMYK grayscale modes, which preserves the tone information of the original image more comprehensively).
3. The gray-scale image is double-g1lh2jg color design using the two-tone tool. In the process of using the two-tone tool, you can adjust the two-color curve to achieve the ideal two-color effect according to your own design needs. Then store the two-color design file as PhotoshopEPS file format. In this way, the color separation task of the two-color printing design image is completed, because the technique of the two-color printing design lies in the two-color design of the image.
There are some graphic designers who are not well versed in the principles of printing technology and are not proficient in the performance of Photoshop software. So the wrong approach is often used for two-color printing designs. There are two main forms:
First, directly select the image components of two corresponding channels in the four color channels C, M, Y, and K, or select two channels with rich image layers to output the plate making. This method only uses the partial tone information of the image one-sidedly and sacrifices the hierarchical information of other channels, which inevitably leads to image distortion.
Second, in order to enhance the tone information of some channels, first convert the CMYK mode of the image into the Grayscale gray mode, that is, merge the four color channels into a monochrome channel, then switch back to the CMYK four-color mode, and finally select two. Corresponding to the image component of the channel, output plate making. Compared with method one, although this method improves the level of images in some channels, it still loses more layer information of other channels and causes image distortion.
The basic elements of layout design are composed of images, vector characters, decorative lines, and color blocks. This requires that images that have been designed in two colors must be combined with their corresponding explanatory text, and the text, decorative lines, and The color of the color block is defined by its own palette, so the key to two-color printing design skills is:
Photoshop image two colors imported in the group software (such as Pagemaker, Freehand, etc.) must be used as the two-color used in the group software. For example, the color of a certain image after the design of the Photoshop two-tone tool is black and PANTONE1915. When the image is placed in the page maker Pagemaker, the image will be automatically brought into the color palette of the Pagemaker software. Two spot colors black and PANTONE1915, when defining text, decoration lines and color block colors in Pagemaker software, you must only use black and PANTONE1915 two spot colors, so as to ensure that the book's later output plate making is two-color.
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