22. In the color separation, when the image is transferred from RGB to CMYK, the naked eye can see some color changes on the screen. What is the reason? What is the effect on the image color?
A: When the image is converted from the RGB color mode to the CMYK color mode, some vivid colors on some images will produce obvious changes. Obviously, this change can be observed, and it will generally change from bright colors to dull ones. Some colors. This is because the color gamut of RGB is larger than the color gamut of CMYK. That is to say, some colors that can be expressed in the RGB color mode are beyond the color range that can be expressed by CMYK after they are converted to CMYK. Replace with similar colors. Therefore, these colors produce more obvious changes. Actually, if there is a color exceeding the color gamut in the image of the RGB color mode, the Gamut Warning may be used for preview.
23, what is the gamut space? What is the significance of clarifying the gamut space?
We edit images in RGB, CMYK, and Lab, and the essential difference is working in different color gamut spaces. The color gamut refers to the range of colors that can be expressed by a certain color model, and also refers to the range of colors that can be represented by specific media such as screen display, printer output, and print copy. The color of the visible spectrum of the natural world constitutes the largest color space, and this color space contains all the colors that the human eye can see. In the color mode, Lab has the largest gamut space. It contains all the colors in RGB and CMYK.
24. What is the best mode for designing the color mode of an image?
A: In Photoshop, the color modes of an image are RGB mode, CMYK mode, GrayScale mode, and other color modes. The use of any mode for designing image patterns depends on the end use of the design image. If the designed image is to be printed or printed on printing paper, it is best to use the CMYK color mode so that the colors seen on the screen and the output printing color or printing color are relatively close. If the design is for electronic media display (such as web pages, computer projections, video recordings, etc.), the color mode of the image is best to use RGB mode, because the RGB mode is more vivid and richer in color and the picture looks better. And there are only 3 channels in the image, the data volume is smaller, and the space occupied by the disk is also less. If the image is gray, use GrayScale mode is better, because even if the image is expressed in RGB or CMYK color mode, it still looks neutral gray color, but its disk space is much larger. In addition, if the gray image is to be printed, if it is expressed in the CMYK mode, there are four editions of the film and printing, the cost will not be large, and it may cause color cast problems when the balance of gray balance is not good at the time of printing. When the ink volume is too large, color shifts occur in gray images.
25. How is gold and silver printed? What are the requirements for prepress design?
A: In the design, customers often require the use of gold and silver printing. Because gold and silver can not be achieved by four-color printing, their printing and technology have special requirements. When printing, gold and silver are processed according to spot colors, that is, they are printed with gold ink and silver ink. Therefore, the film should also be a spot-colored film. A separate film sheet is to be printed and printed separately.
In computer design, a color should be defined to represent gold and silver, and defining the color type as a spot color can meet the design requirements. Since gold, silver, and silver are opaque, gold and silver content can be set to be overprinted at design time.
26, what is the spot color and spot color printing?
A: Spot color means that when printing, instead of printing this color by printing four colors of C, M, Y, and K, the specific color is used to print the color. Spot color inks are pre-mixed by the printing plant or produced by the ink factory. For each spot color of a print, there is a special color version corresponding to the print. Using spot colors can make colors more accurate. Although the color cannot be accurately represented on a computer, the pre-printed color sample card of the standard color matching system can see the exact color of the color on the paper, such as the Pantone color matching system to create a very detailed color sample card .
For the non-standard spot color colors set in the design, the printing factory may not be accurately deployed, and the exact color cannot be seen on the screen. Therefore, if it is not a special requirement, it should not be easy to use a spot color of its own definition.
27. What are the commonly used color methods in computers? What is the best way to define a color?
A: Whether on a computer or printing, you need a way to describe different colors. The colorimetric method is also called a color model or a color model. There are many types of color models, each of which can describe colors from different angles, but different color modes are suitable for different occasions, and the accuracy is different.
The computer color mode is:
(1) RGB mode: Also called RGB color space. It is a color light color model, it is widely used in our lives, such as televisions, computer monitors, slides, etc. are using light to color. In printing and publishing, it is often necessary to scan an image. The scanner first extracts the RGB color light information on the original image when scanning. The RGB mode is an additive mode in which any color can be described by the amount of radiation of R, G, and B. When R-, G-, and B-components of the computer-defined color are in the range of 0 to 255,0, there is no stimulus, and 255 is the maximum stimulus. When R, G, and B are both 255, white light is synthesized, and when R, G, and B are both 0, black is formed. This mode is often used when displaying color definitions on the display. Images such as TV, slideshow, web, multimedia, generally use RGB mode.
(2) CMYK mode: Also called CMYK color space. For people working in the printing industry, CMYK is the most familiar. This mode is a subtractive mode that follows the subtractive mixing rule. The essence of CMYK mode refers to the size of C, M, Y, and K dots printed when the color is reproduced. Therefore, the numerical range of C, M, Y, and K is 0%-100%. CO%MO%YO%KO% indicates white, and C100%M100%Y100%K100% indicates black.
(3) HSB mode: Hue (HUE), saturation (Saturation), and Brightness mode.
28. Since the RGB graph is better than the CMYK graph, the color is more beautiful. Can the RGB graph be output directly? What are the consequences of doing so?
A: Since the color gamut of RGB is larger than CMYK, some colors are displayed on the screen. However, four-color inks cannot be printed. To know the consequences, just try. Due to the differences in RIP, RGB images may only have black images on the separation film, no images on other color versions, and it may be that the information (dot) of the images on the four-color film is exactly the same, that is, the equivalent grayscale image. Although some distribution software or RIP can convert RGB to CMYK, it is best to use scan software or Photoshop to perform the mode conversion.
29. The color picture is stored in the DCS format. There are pictures when printing the black and white manuscript, but there is no picture on the output film. Why is that?
A: The last half of the image will be stored in DCS format will produce five files, if you do not send the five files together, there will be no picture on the output film.
30. What is RIP? Why do you like software RIP now?
A: RIP is an abbreviation for RasterProcessing. It refers to a software or hardware card that interprets Postscript code as a bitmap image in a photo system. It is generally called a raster image processor. It plays an important role in the color publishing system. Its function is to quickly interpret the prepared page as a command that can control the output of the laser recorder. It can automatically convert text, graphics, and images in the page. Into a digital lattice information, and then use these information to control the output device to record, so that its work is "off" or "on."
The upgrading of hardware RIP requires complex processes and a long time, and it cannot adapt to the rapid development of software technology. Software RIP is widely adopted because of its advantages such as update, speed, high processing quality, high speed, and display of post-processing results. And a software RIP can drive multiple imagesetters at the same time, the network function is strong.
31, why not set the resolution in the typesetting and graphics software?
A: The typesetting graphics software is an object-oriented software. Expressions of characters and graphics are expressed in an algorithm language. Objects produced are independent of the resolution. They are output at the output device resolution. The resolution of the output device is high, and the resolution of the graphic output of the production page is high. Therefore, graphics software and layout software do not need to set the resolution. The images imported in the layout and graphics software are read from the original image when output. This is related to the resolution of the original image.
32, CorelDraw text in several types?
A: CorelDraw divides the text into two different types. One is art text and the other is paragraph text. Although both texts are created using text tools, they have different characteristics. With more graphic objects, more special effects can be applied to text art texts; paragraph texts can use more text formats. Based on the different characteristics of the two texts, they can be used for different purposes respectively. If only a small amount of text is needed or more formatting is applied to the text, such as short titles and descriptions, the art text can be used; Need to deal with a large number of text applications more formatting, such as newspapers, brochures, etc., can use paragraph text.
Source: Meike Design Online Teaching
A training chair is a seat designed specifically for activities such as training and meetings. It has the characteristics of comfort, durability, and ease of movement, which can meet the needs of different groups of people. Training chairs can be classified into various categories based on material, structure, function, and other aspects. Below will be a brief introduction to the classification of training chairs.
1. Material classification
The materials of the training chair mainly include metal, plastic, and fabric. Metal training chairs typically have strong stability and durability, making them suitable for long-term meetings or training activities. The training chair made of plastic material has the characteristics of lightweight and easy to clean, making it easy to arrange the meeting site at any time and suitable for use in multifunctional halls and other places. The training chair made of fabric has a comfortable sitting experience and good breathability, making it suitable for long-term meetings or training activities.
2. Structural classification
The structure of training chairs mainly includes single chairs, linked chairs, and foldable chairs. Single chairs are the most common training chairs, with each seat being independent and adjustable as needed. Chainage refers to the connection of multiple seats together, usually in the form of one or more rows, suitable for use in large training venues. Stackable chairs are training chairs that can be folded and stacked, saving space and facilitating storage and handling.
3. Functional classification
The main functions of the training chair are adjustable, rotatable, foldable, and storable. The adjustable training chair can adjust the height and angle according to personal needs, providing a more comfortable sitting posture. The rotatable training chair can rotate 360 degrees, facilitating communication and interaction with people around it. The foldable training chair can be conveniently stored and transported, making it suitable for use in multifunctional halls and other places. The training chair that can store items is designed with storage space below or behind the chair, making it convenient to store items such as stationery and documents.
In summary, the classification of training chairs mainly includes material classification, structural classification, functional classification, etc. Choosing a suitable training chair can provide a better user experience and improve the effectiveness of training and meetings.
Meeting Chair,,Foldable Chair,Customized Chair
Foshan Shengshi Zhihui Technology Co., Ltd. , https://www.officer-furniture.com