Computer graphic design and prepress graphic processing (4)
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42. What are the characteristics of PS fonts?
A: PS fonts are a curved outline font described in Adobe's PostScript language. PS fonts are designed for PS device output and are used primarily for laser printers and laser imagesetter output. Since the screen is not a PS device, the PS word is not used for screen display. Therefore, the PS word is displayed in the corresponding dot matrix font when it is used. The PS font is the best print quality font, and can be scaled at will, and the print is clear and smooth. PS fonts are typically installed on a hard drive connected to a printer or imagesetter.
43. Why is it better to use a PS printer when printing proofs to customers?
A: The page interpretation language (PDL) used by the printer to interpret the page. In addition to the PostScript language, most non-printing professional printers use their own printing language, such as HP's PCL language. If you use general non-PS printing for proof printing, some errors in the production may not be found, especially the errors related to PS interpretation are not easy to find, which may cause work losses. The page interpretation language and the final output language when printing with a PS printer are the same, and any problems can be discovered as early as possible.
44. What is RIP? Why do you like to use software RIP now?
A: RIP is Raster Image Abbreviation for Processing, which refers to a software or hardware card that interprets PostScript code as a bitmap image in a photo system, generally referred to as a raster image processor. It plays an important role in the color publishing system. Its function is to quickly interpret the produced page as a command to control the output of the laser recorder. It can automatically convert the text, graphics, images and other elements in the page. Into the digital dot matrix information, and then use this information to control the output device to record, let its work is "off" or "on". The upgrading of hardware RIP requires complex processes and long time, and can not adapt to the rapid development of software technology; and software RIP is widely used because of its fast update, high processing quality, high speed, and display of post-processing results, and a software. RIP can drive multiple imagesetters at the same time, and the network function is strong.
45. What is color management?
A: Color management has two meanings: First, it is determined by the basic requirements of traditional color reproduction, that is, basic setting and selection according to the color reproduction characteristics determined by paper, ink and other printing conditions, including tone reproduction, Gray balance and color correction, etc., the purpose is to adapt the color separation and printing conditions. Tone reproduction refers to the correct setting of highlights, shadows, and midtones to accurately reflect the gradation of the original. This setting should be based on the characteristics of the paper and ink, regardless of the display of the computer. Gray balance is determined by specific paper, ink, and other printing conditions. Accurately determining the gray balance point helps to accurately replicate all colors and prevent color shift. Color correction is based on the specific original color, and the CMYK printing ink is adjusted to achieve accurate hue and sufficient color saturation. The other aspect of color management is based on the automatic color management of the desktop publishing system or the graphic design system, that is, the software is used to calibrate the device, characterize different color spaces, and color for different input and output devices. Pass for the best color match.
46. What is the purpose of color management?
A: The purpose of color management is: matching of scanner and scanner: color matching of different input devices, including various scanners, photoCD, digital camera, etc.; printer and printer matching: color matching between different output devices , including color copiers, digital proofing machines, fast (direct) printing; display and display, display and printing matching: to achieve consistency of display of different displays, and enable the display to accurately predict the output of the finished product; matching of the original and printing: to achieve High quality color matching from scan to output. Realize color management content embedded in image files, so that images can maintain color consistency regardless of the device. See Figure 1.
47. What are the three elements of color management?
A: There are three aspects in color management that are very important. It is also the three main elements of color management:
1 Calibration—Adjust the device according to the operating parameters of the device such as scanner, monitor, printer, etc.
2 Characterization—Determine which color range or reproducible color of the input and output devices is, and create a corresponding feature parameter file, also called a device profile.
3 Conversion—Transfers an image from the color space of one device to the color space of another device under known conditions. The purpose of the conversion is to make the color seen on the screen and the final print as consistent as possible with the original. Since the color space of the print output device is smaller than the color space of the original, the color space is compressed and converted. There are several types of color space conversion: RGB to CMYK (scanner to printer), RGB to RGB (scanner to screen), CMYK to CMYK (a printer to another printer).
In this way, the relevant equipment has been calibrated and characterized accordingly. On this basis, the color conversion is performed according to the relevant data files to realize the color in the whole process from the original input, the computer display processing to the various color outputs. Consistent.