Printing FAQ (6-12)

6. What are the workflows for prepress design or computer design?

A: The general workflow has the following basic processes:

1 Clear design and printing requirements, accept customer data 2 Design: Including input text, images, ideas, make 3 out of black and white or color proofs, let the customer modify 4 Press the school draft modify 5 Re-release the school draft, let the customer modify until Finalization 6 After signing the customer out of the film 7 Pre-press proofing 8 Submit the proofing to the customer to see if there is a problem. If there is no problem, let the customer sign it. All work on prepress design is completed. If there is a problem in the proofing, you have to modify it and re-export the film.

7. What is the workflow for designing a computer design system?

A: The workflow in the design system is as follows: 1 First, the original is scanned according to the final size of the image, and the image is adjusted in the image software. At the same time, some creative design work can be completed.

2 In the graphics or typesetting software layout design work: including input text, draw graphics, put images.

3 After the customer finalizes the document, it sends the document to the output center to output the film. The laser imagesetter works with the Postscript language. The layout is described by the RIP (Raster Image Processor) as a bitmap and divided into four colors: C (Cyan), M (Magenta), Y (Yellow), and K (Black). sheet. If the final design requirement is not an output film, but a large-scale color inkjet sample, then the inkjet printer output is sufficient.

8, what is the density?

A: The light phenomenon of a color object generally has transmission, reflection, and selective absorption. As shown in Figure 3-20 (color), O is a color object. When the light energy of the incident light is Q in, it is selectively absorbed by the object O. The transmitted or reflected light energy is Q out. The density of the object O is: D = lg (Q out / Q in) Therefore, the density represents the nature of the amount of light absorbed by the object. The object absorbs a large amount of light and its density is high: the object absorbs a small amount of light and its density is low. Density is a common physical quantity used by the printing industry to measure the light transmittance of printed films and the depth of prints. Greater China Graphic Arts Network

9. How to choose the correct output net?

A: In order to avoid collision, in theory, the color difference between the two should be 22.5 degrees, but the practice proved that the four angles of 15 degrees, 45 degrees, 75 degrees and 90 degrees works well, the yellow version of the visual stimulation Weak, poor visual sensitivity, it is generally set to 90 degrees, the most sensitive to the 45-degree angle of vision, the original main color of the original magenta or cyan is fixed at 45 degrees. For example, for the blue sky and white clouds, the cyan version should be set at 45 degrees. For the sunset and setting sun, the magenta version should be set to 45 degrees, and the magenta and blue ones should be set to a non-45 degree angle. For 15 degrees, the black version is set to 75 degrees.

10. After the file is output, only the black version has a horn. Other versions do not have horns. What should I do?

A: The only way is to re-output and change the color of the corner from 100% BK to 100%C100%M100%Y100%BK, that is, change the monochrome black to four-color black.

11. What should I do if the color version and the original color version of the replacement are not set?

A: Output all the color versions again. Although this is the most stupid way, it is the safest way.

12. What is the difference between the output film and the good or upside down?

When the film is output, it is determined whether the film is facing upwards or downwards depending on whether the film is positive or negative. When a film is taken out, whether the film is facing upwards or downwards is an anti-positive film. When a negative film is selected, the medicine film is selected facing upwards to obtain a positive film. Because for the positive film, the film can be directly printed, the film surface is just in contact with the PS plate, and the printing effect is good. For the negative film, it must be copied into a positive film before the printing version, in the copy, the negative film is placed on the copy table, the film is facing up, and then stack the copy film, so that the film also happens to be in contact with the film surface To ensure copy quality. During the printing and copying process, the light source does not directly shine on the film surface.

---Source China Great Britain Graphic Arts Network