Graphic design is the basic work of printing design. Without the basis of graphic design, printing design can not be done. The basic principle of printing graphic design is that in addition to the operation of graphic design software, the design of graphic design, it is necessary to understand what kind of design. The ability to print, whether the design works meet the printing conditions, so graphic designers need to learn printing knowledge to better create works that meet customer requirements.
What is image resolution and why is it emphasized?
A high-resolution image contains more pixels than a low-resolution image of the same size, and has more image information and clearer details, which is one reason for determining the image resolution in consideration of output factors. If an image is displayed on the screen, the resolution is 72 pixels / inch; if used for 600Dpi printer output, it requires 150 pixels / inch image resolution; if you want to print, you need 300 pixels /inch high resolution. The image resolution setting should be appropriate: if the resolution is too high, the running speed is slow, and the occupied disk space is large; if the resolution is too low, the expression of the image details is not affected, and the corresponding quality requirements are not met.
Why do images need to have an image file format? There are several image file formats that are often involved before printing. What are the properties?
The image file format determines how the file is compatible with various applications and how the file exchanges data with other files. Since there are many formats for images, the format of the image should be determined according to the purpose of the image. The image file formats commonly used in design are: TIFF format: TIFF is a tagged image file for saving images composed of color channels. Its biggest advantage is that the image is not limited by the operating platform, regardless of PC or MAC. UNIX machines can be used universally. It can store alpha channels and store color separation data in a single file, which is the most common image format for printed documents. EPS format: EPS format is used for printing and printing. It can store Duotone information, store Alpha channel, and store path and screen information.
What is the printing color?
The printing color is a color composed of different percentages of C (cyan), M (magenta), Y (yellow), and K (black), so it is more reasonable to call it a mixed color. C, M, Y, and K are the four primary colors used in printing. In printing, these four colors have their own color version, and the dots of this color are recorded on the color plate, and the four color plates are combined to form the defined primary colors. In fact, the four printed color dots on the paper are separated, but the distance is very close. Because our eyes have limited resolution, they cannot be distinguished. The visual impression we get is the blending effect of the various colors, thus producing a variety of different primary colors. Y, M, and C can synthesize almost all colors, but black is also required, because the black produced by Y, M, and C is impure, and a more pure black is required for printing. The electronic files used for printing must be four-color files (ie C, M, Y, K), and files in RGB color mode cannot be used for print output. Remember!!
What is color separation? Is color separation so important? How to color separation in Photoshop?
Color separation is a printing term that refers to the decomposition of various colors on the original into four primary colors: yellow, magenta, cyan, and black. In computer-printed design or graphic design image software, the color separation work is The color mode of the scanned image or other source image is converted to CMYK mode. Generally, the scanned image is in RGB mode, and the image taken with a digital camera is also in RGB mode. Most of the images downloaded from the Internet are in RGB color mode. If you want to print, you must divide the color into four colors: yellow, magenta, cyan, and black. This is the requirement for printing. If the image color mode is RGB or Lab, it is possible to output only the dot on the K version, that is, the RIP interpretation only interprets the color information of the image as gray. In Photoshop, the color separation operation is actually very simple: you only need to convert the image color mode from RGB mode or Lab mode to CMYK mode. Thus, the color of the image is represented by the color material (ink), and has a channel of 4 colors. When the image is output, the image will be generated according to the channel data of the color, and divided into four pieces of yellow, magenta, cyan, and black. Color separation film.
In the case of color separation, when the image is transferred from RGB to CMYK, the naked eye can see that some colors on the screen will change significantly. What is the reason? What effect does it have on the color of the image?
When the image is changed from RGB color mode to CMYK color mode, some vivid colors on the image will change significantly. This change can sometimes be observed obviously. It usually changes from bright color to darker color. . This is because the color gamut of RGB is larger than the color gamut of CMYK, which means that some colors that can be represented in RGB color mode are beyond the range of colors that CMYK can express after switching to CMYK. These colors can only be used in similar colors. Color substitution. Thus these colors produce a more pronounced change.
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