Pre-press graphic question and answer (5)
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48. What is color independent of the device?
Color-independent of the device is an important part of implementing the image information exchange standard, which means that the image color data obtained by one image processing device should be correspondingly restored on another processing device. To achieve color independent of the device, it must first be able to objectively evaluate the color and density of the image and the transformation characteristics between the processing devices.
49. How to achieve color management in the color management system (CMS)?
A: The devices used to create colors include scanners, monitors, desktop printers, and printers, each of which reproduces a limited range of colors. We refer to the color that a device can reproduce as a color table. The color table of many devices is 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 into a device-independent color mode - CIELab color mode, and then perform color mapping processing between devices to embed the converted device-independent color information into another device. The color table, so that the color table of the device can be matched. There are two ways to coordinate the chromatograms of different devices: one is to preserve the relationship between colors by transforming all the colors into the chromatogram of the device; the other is to map the colors outside the chromatogram to what the device can produce. In color, without preserving the relationship between colors.
50. What are the color management processes?
A: An ideal color management process is as follows: 1. Determine the color performance characteristics of the display: Some color management systems pre-set the display color profiles provided by various manufacturers to form a comprehensive internal profile. The profile library can be called when determining the color characteristics of the display. 2. Calibrate the display. Adjust the white point and other display characteristics of the display to match your output requirements. For example, if output to a print medium, then it may be considered to calibrate the white point of the display to the color temperature of the printed 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. The resulting color value is then compared to the standard color value and all difference information is recorded as a profile file for the scanner for use in scanning. 4. The color management system converts the scan results into a color space of the display. 5. Determine the characteristics of the color print and output device. That is, a color printer supported by the color management system, printing conditions and other output devices select a color profile. 6. The color management system uses the profile files of the display and the printer to change colors. Some systems allow "soft proofing" on the screen (ie, representing CMYK colors on the screen).
51. Why is the color management of the display particularly important?
A: Although the display is a computer output device, it is an important reference window for designers to adjust color, perform color matching, observe image depth, and adjust the level. Although we all know that there is a gap between the color on the display and the color printed, the judgment of the level, depth, and definition of the image is based on the display of the display, because we can not color the color of each pixel. The data is read. Second, the display is the visual center of the design, regardless of the color mode of the image, it must be reflected on the display. As shown in Figure 1 (figure omitted). The digital image of the RGB color mode is displayed on the display, and the digital image of the CMYK color mode is also converted and displayed on the display. The images of the two color modes of the same file may have different colors on the display.
52. Why not set the resolution in typesetting and graphics software?
A: The typesetting graphics software is object-oriented software. The representation of text and graphics is expressed in an algorithmic language. The objects produced are not compatible with the resolution. They are output at the output of the output device. If the output device has a high resolution, the image output resolution of the created page is high. Therefore, graphics software and typesetting software do not need to set the resolution. The image imported in the typesetting and graphics software is required to read the dot matrix information of the original image when outputting, which is related to the resolution of the original image.
53. What is digital proofing?
What kind of digital proofing is the most reliable? A: Digital proofing will output proofs directly from the computer's prepressed or designed documents, instead of using the traditional proofing machine to simulate the proof with ink. There are many digital proofing methods. The digital proofing schemes introduced by different manufacturers are different. It can be roughly divided into the following categories: 1 Directly output inkjet proofs: This is the easiest way to print files directly by the printer driver. However, because the idea of the inkjet printer is diffused, the color is bright, and the proof is far from the printing result. 2 The second use color management, and then use the inkjet printer output: the color of this method is close to the printing color, but because there is no RIP interpretation, there is still some gap with the printing, and it is easy to make mistakes. 3 After using RIP to explain, use halftone dots to output halftone dots: This method can find related errors and high accuracy because RIP is the same as the printing plate. 4 Use the same RIP as the printing film or printing plate, and use the transfer method to express the dots with the color layer, such as DuPont's proofing method.
54. What is CIP3?
A: CIP3 is the abbreviation of Cooperationfor Integration of Prepress, Press, Postpress. It is an international cooperation organization. Its members are composed of many international companies dealing with images and words. There are 34 major members to date. The purpose of this organization was to standardize and standardize prepress, postpress, and print digital controls, and to create conditions for digital image processing and printing. CIP3 already has a unified file format PPF, PrintProductionFormat. The production control of each print can generate a CIP3 specification file to control the entire process. The PPF file can be a variety of digital control commands 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 the prepress processing, the ink coverage area value at the time of printing is generated according to the image, the PPF file is generated and sent to the printer, and the printer ink control system supplies the ink according to the data PPF file. CIP3 is a must for digital workflows.
55. The resolution of the lithographic scanner is written as 600 × 1200dpi, what does it mean?
A: The resolution of the flatbed scanner includes resolution in two directions: one is the horizontal direction resolution, that is, the distribution density of the CCD unit; the other is the resolution in the vertical direction, that 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 www.cgan.net
56. What is the current level of high-end flatbed scanners?
A: With the advancement of technology, flatbed scanners are getting closer and closer to roller scanners. For example, the optical resolution of the Japanese screen company can reach 5300dpi, which can fully meet the requirements of high-end color printing. In addition to resolution, high-end flatbed scanners now generally have the following features: the scanning area is getting larger and larger, and can scan A3 or larger originals; the density range is up to 4.0, which is comparable to the roller scanner; the scanning speed is high. It can adapt to mass production; it has artificial intelligence function, which can scan according to the original type; eliminate the moiré technology; screen scanning, adapt to the CTP process; the original is widely adapted: photos, lines, prints, positives, negatives. In addition, some high-end flatbed scanners have XY-scan capability: their CCD can be moved in both X and Y directions, enabling higher optical resolution and ensuring higher image quality anywhere on the original table. Resolution and clarity. Some high-end flatbed scanners also have a Z-direction zoom scanning capability: they can change the focal length of the optical system and simultaneously change the scanning area and optical resolution.
57. What is the scanner's xy scanning technology?
A: There are many high-end flatbed scanners that use xy scanning technology. They all have "XY" letters on the scanner name, such as AgfascanXY-15, Ar-tixScan600XY, etc. It means the scanner is in X, Y. The scanning precision in the directions (ie, horizontal and vertical) is equal. The accuracy of most flatbed scanners in the horizontal and vertical directions is unequal, thus affecting the accuracy and resolution of image scanning. XY scanning technology delivers the highest resolution scanning quality anywhere in the scanner, making it a technological advancement for non-XY technology scanners.
58. What is the De Moire function?
A: De Moire is a scanning patent technology of Japan Screen Company, which is a kind of software. It can effectively eliminate the moiré that exists in certain types of originals. We all have the experience that when scanning fabrics and speakers, even a positive-color original will produce object moiré. De Moire can automatically detect potential Moire regions in the image and then eliminate them to produce the desired final result.
59. What is "CopyDot"? How is it different from traditional analog copy?
A: “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 plate making process means that the film is closely combined with the photosensitive material, and then vacuumed by the copying machine, and then exposed and copied, and then rinsed with the developing solution, thereby transferring the image from one film to another. The purpose of the above. "CopyDot" uses digital image reproduction technology to scan the text, lines and images of the film through a scanner with "CopyDot" function, so that the film dot becomes the corresponding data, and the information on the film can be integrated into the data. Imposition, grouping throughout the digital workflow. It solves the problem that the four-color film is inaccurate due to long storage time, repeated use or too large film format, and the quality problem caused by film yellowing and scratching can also be scanned by the dot scanner. Repairs are not available in traditional analog copies. Scanner Copy The Dot function was developed to accommodate the needs of direct platemaking and digital printing processes, as digital printing does not require film, but sometimes the film that the customer handed in or the original that was previously saved was film, and Copy Dot was used. Digitally plate or print directly with other content.