What does color have nothing to do with equipment?
Color has nothing to do with equipment is an important part of the realization of image information exchange standards, its meaning is that the image color data obtained by a certain image processing device should be able to be restored on another processing device. To achieve color-independent device, we must first be able to objectively evaluate the conversion characteristics between the color and density of the image and the processing device.
How to realize color management in the color management system (CMS)?
The equipment used to create colors includes scanners, monitors, desktop printers, and printing presses, each of which can reproduce a limited range of colors. We refer to the colors that a device can reproduce as a color table. The color tables of many devices are recorded in a culture called "Profile". The color management system obtains the color table of the device from this file. The color management system will convert the color table of a device to a device-independent color mode-CIELab color mode, and then perform color mapping between devices to embed the converted device-independent color information into another device. In the color table, so that the color table of the device can be matched. There are two methods for coordinating the color spectrum of different devices: one method is to transform all colors into the color spectrum of the device, thereby preserving the relationship between the colors; In the color, the relationship between the colors is not preserved.
What are the color management processes?
An ideal color management process is as follows: 1. Determine the color performance characteristics of the display: some color management systems preset the display color profiles (Profile) provided by various manufacturers together to form a comprehensive internal preset file profile library , Can be called when determining the color characteristics of the display. 2. Calibrate the monitor. Adjust the white point of the monitor and other display characteristics to meet your output requirements. For example, if outputting to a printing medium, it may be considered to calibrate the white point of the display to the color temperature of the printing paper. 3. Determine the characteristics of the scanner or other input device. If the color management system provides an IT8 sample, it can be scanned or photographed. Then compare the obtained color value with the standard color value, and record all the difference information as a profile file of the scanner for use in scanning. 4. The color management system converts the scan results into the color space of the display. 5. Determine the characteristics of color printing and output devices. Choose a color profile for color printers, printing conditions and other output devices supported by the color management system. 6. The color management system uses the profile files of the display and the printing machine to change colors. Some systems allow "soft proofing" on the screen (ie, CMYK colors are displayed on the screen).
Why is color management of monitors particularly important?
Although the display is a computer output device, for designers, it is an important reference window for adjusting colors, color matching, observing image depth, and adjusting levels. Although we all know that there is a gap between the colors on the display and the colors printed, the judgment of the image's gradation, depth, clarity, etc. is based on the display of the display, because we can't determine the color of each pixel The data are all interpreted. Secondly, the display is the visual center of the design. No matter what the color mode of the image is, it should be reflected on the display. As shown in Figure 1 (figure omitted). The digital image in RGB color mode should be displayed on the monitor, and the digital image in CMYK color mode must also be converted and displayed on the monitor. The colors of the two color mode images of the same file may be different on the monitor.
Why not set the resolution in typesetting and graphics software?
The typesetting graphics software is object-oriented software, and the representation of text and graphics is expressed in algorithmic language. The objects produced are not compatible with the resolution. They are output at the resolution of the output device when they are output. If the resolution of the device is high, the graphic output resolution of the page is high. Therefore, graphics software and typesetting software do not need to set the resolution. When importing images in layout and graphics software, it is necessary to read the dot matrix information of the original image, which is related to the resolution of the original image.
What kind of digital proofing is the most reliable?
Digital proofing is to output proofing proofs directly from a computer pre-press or a designed file, instead of using traditional proofing machines with ink to simulate proofing. There are many digital proofing methods. The digital proofing solutions introduced by different manufacturers are different. It can be roughly divided into the following categories: â‘ Directly output inkjet proofs: This method is the simplest, and the printer driver directly prints the file. However, because the ideas of inkjet printers are diffuse and colorful, the proofs are far from the printed results. â‘¡ The second one uses color management, and then uses an inkjet printer to output: the color in this way is relatively close to the printing color, but because there is no RIP explanation, there is still a gap between printing and printing, and error-prone. â‘¢After using RIP to explain, use color inkjet machine to output halftone dots: this way, because RIP is the same as the printing plate, related errors can be found and the accuracy is high. â‘£Adopt the same RIP as the printed film or printing plate, and use the transfer method to display the dots with a color layer, such as DuPont's proofing method.
What is CIP3?
CIP3 is short for Cooperation for Integration of Prepress, Press, and Postpress. It is an international cooperation organization, and its members are composed of many international companies that process images and words. There are 34 major members so far. The purpose of this organization is to standardize and formulate pre-press, post-press, and digital printing control, and create conditions for digital image processing and printing processing. CIP3 already has a unified file format PPF, namely PrintProductionFormat. The production control of each printed product can generate a CIP3 specified document to control the entire process. The PPF file can be a variety of digital control instructions that control plate making, printing, folding, die cutting, and binding, and can control the production process accurately and at high speed in production. For example, during prepress processing, the ink coverage area value during printing is generated from the image, a PPF file is generated and sent to the printer, and the ink control system of the printer supplies ink according to the data PPF file. CIP3 is a must have in the digital workflow.
The resolution of a lithographic scanner is written as 600 × 1200dpi, what does it mean?
The resolution of the flatbed scanner includes two directions of resolution: one is the horizontal resolution, that is, the distribution density of the CCD unit; the second is the vertical resolution, which is the step size of the scanning motor. Here 600dpi refers to the horizontal CCD distribution density, and 1200dpi refers to the step size of the forward motor. Greater China Graphic Arts Network
What level of development of high-end flatbed scanners now?
With the advancement of technology, flatbed scanners are getting closer and closer to roller scanners. For example, the screen resolution of Japanese screen company's Caixian scanner can reach 5300dpi, which can fully meet the requirements of high-end color printing. In addition to the resolution, high-end flatbed scanners now generally have the following functions: the scanning area is getting larger and larger and can scan A3 or larger originals; the density range can reach about 4.0, which is comparable to the drum scanner; the scanning speed is high, Can be adapted to mass production; with artificial intelligence function, can be scanned according to the type of manuscript; eliminate moire technology; dot scanning, adapt to CTP process flow; manuscript adapt to a wide range: photos, lines, prints, positives, negatives. In addition, some high-end flatbed scanners have the ability to scan in the XY direction: that is, their CCD can be moved in the X and Y directions, can obtain higher optical resolution, and ensure that the image located at any position on the original table has a higher Resolution and clarity. Some high-end flatbed scanners also have Z-direction zoom scanning capabilities: they can change the focal length of the optical system, and can simultaneously change the scanning area and optical resolution.
What is the xy scanning technology of the scanner?
Many high-end flatbed scanners now use xy scanning technology, and they all carry the "XY" letter on the name of the scanner, such as AgfascanXY-15, Ar-tixScan600XY, etc. It refers to the scanner in the X, Y direction That is, the scanning accuracy in the horizontal and vertical directions is equal. Most flatbed scanners have unequal accuracy in the horizontal and vertical directions, which affects the accuracy and resolution of image scanning. XY scanning technology can get the highest resolution scanning quality anywhere in the full range of the scanner, which is a technical improvement for non-XY technology scanners.
What is the De Moire function?
De Moire is a scanning patented technology of Japanese Screen company and is a kind of software. It can effectively eliminate the moiré existing in a certain type of manuscript. We all have the experience that when scanning cloth patterns and speakers, even positive color manuscripts can produce object moire. De Moire can automatically detect the potential Moire area in the image and then eliminate it to produce the desired final effect.
What is "CopyDot"? How is it different from traditional analog copies?
"CopyDot" is a copy of the dot, which is different from the "copy" of the traditional analog platemaking process. The "copy" in the traditional analog platemaking process refers to the close combination of film and photosensitive material, vacuum extraction by a copying machine, and exposure and copying, and then washing with developer to achieve the transfer of graphics from one film to another. On purpose. "CopyDot" uses digital image copy technology to scan the text, lines and images of the film through the scanner with the "CopyDot" function, so that the film dots become the corresponding data, and the information on the film can be integrated into the data after being digitized. In the entire digital workflow of imposition and assembly. It solves the problem of inaccurate overprinting caused by long-term storage of four-color film, repeated use or too large film size. At the same time, quality problems caused by yellowing and scratching of the film can also be scanned by the dot scanner To repair, this is not available in traditional analog copies. The Copy Dot function of the scanner was developed to meet the needs of direct plate-making and digital printing processes, because digital printing does not require film, but sometimes the film delivered by the customer or the previously saved original is film, you will need to use Copy Dot , Digitalize the dots directly with other content to make a plate or print directly.
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