Printing FAQ (28-32)

Computer color mode has

1, RGB mode: also known as RGB color space. It is a color light color model, it is widely used in our lives, such as televisions, computer screens, 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 known as 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, Saturation, and Brightness modes.

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: After the picture is stored as the DCS format, there will be five files in the second half.

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 the 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 due to its rapid update, 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 set the resolution. The images imported by 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 these two types of text, 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 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 China Great Britain Graphic Arts Network