Printing Technology Q&A (1-6)

1. Q: I'm going to do a 6m X 3m ad now. I would like to ask how to do this kind of advert in PS. How about the file settings (how many dpi, how many times do you want to shrink?)? The contents of the advertisement include a background image, an icon, and two lines of text. What is the final output format? In addition to using CD to do such an advertisement, how to set up the document? Does the background image need to be imported into the CD after being loaded in the PS?

A: According to the actual size settings, 600 * 300CM, 35DPI on it, inkjet can be done in PHOTOSHOP, do not have to do in CORELDRAW. The pattern is CMYK, and the last figure made into a TIF or PSD is given to the inkjet company. Importing CORELDRAW will be very slow, so it is not recommended to import CORELDRAW.

2, Q: If you really want to do in the CD, how to set the size and resolution? What is the size and resolution of the background image imported at the same time using PS?

A: If the text is a bit more, and the picture is relatively simple, it can be done on the CD. How big is it? I personally think that if you do it in cd, the DPI in PS can be higher, and when you export it as tif, Dpi set to the corresponding size!!!! You want to do in CorelDRAW, import the bitmap resolution (resolution) depends on the accuracy of the use of inkjet equipment if it is 600DPI inkjet, the resolution of the imported bitmap (resolution ) Set to 150DPI original can be. In CorelDRAW production is better, because the text is not a vector sawtooth. In fact, the inkjet printer is not set to 300DPI after the printing accuracy is much higher, the inkjet company from an economic point of view, indoor Photo paper, the highest will be sprayed to 300DPI on it, spray 600DPI on a waste of ink (inkjet can spray 600DPI, and now some can even spray to 1440DPI), so I generally do not recommend setting the resolution to 100DPI or more Of course, if the file size is small, it does not matter if the setting is higher. Generally, it will not be blurred when jetted out around 75 DPI. It is not necessary to convert the RGB mode to CMYK for inkjet printing. Because the RGB color gamut is much larger than CMYK, the color is more vivid. Printing is due to no choice but to switch to CMYK mode. As for the image accuracy you can go to the output company to find out. Too much to do, he will give you smaller changes in order to reduce processing time. This argument is not consistent with the fact that RGB color gamut is wider. Printing with ink as a color carrier cannot use it to reproduce the color of electronic documents. General inkjet printers or inkjet printers use CMYK and light blue and light products. Ink is used to reproduce colors. Although the six-color color gamut is not as wide as the RGB color gamut, it is always wider than the four colors. The color pictures used for printing are converted to CMYK in the software through a set of color parameters ( According to the characteristics of the printing ink, if the RGB image is used during the printing, it is converted into six colors of blue, yellow, black, light blue and light products in the process of embossing (printing) driving and printing (printing) machine ( That is, if you use software to map the RGB image to CMYK, one problem is that the color separation parameters do not match (ink is different from printing ink), and the next problem is that when you print, you need to turn four colors into six colors. There is also a big loss in the middle, so it is not as good as using RGB directly. Basically agree with your opinion. The internal working mode of the inkjet printer is still four-color mode. However, the reason for its wide color gamut is that the color purity and transparency of the inkjet ink are better than the printing ink; the second is that the color synthesis of the inkjet is the mixing of the ink and the printing is the overlay of the ink, so the color saturation is better than the printing. The use of light products and light greens is mainly to compensate for the defects of high light levels. We also use this six-color method in traditional printing. Japan Roland eight-color inkjet printer uses Panton six-color hi-fi technology, which is mainly bright green and bright orange color, so its color gamut is much larger than the general six-color inkjet printer, basically covers 90% of the Panton color area.

3. Q: Is it better to use RGB or CMYK?

A: If you use RGB to spray a perverted customer with a black and white Dongdong, the black will be obtained by superimposing RGB, how much humidity there is, and how much ink will be used, which is wasteful and difficult to do. After a week, there will be a oozing phenomenon. At that time, you will lose money. You cry no time. If I use the CMYK file, I only need one black, and I will not bleed and believe you. Can try.

4, Q: A inkjet company, the client will take the design draft, as the inkjet company in the Photoshop generally do those aspects of adjustment. What should be noted.
A: Adjust the color so that the picture ejected by the inkjet printer meets the customer's requirements.

5. Q: As the operator of the inkjet company, what work is generally required to be done. The design has been completed by the customer. Is it just the client's file into the computer and then open and adjust in the PS, and then start the inkjet it? What kind of knowledge is also needed!

A: Sometimes the customer draft is very small, you need to enlarge it, adjust the color, deal with the defects of the screen, or sometimes the customer will give you the FAX new figure SIZE, you change the screen according to his SIZE.

6, Q: General inkjet is using Photoshop, there is no use of Illustrator or CorelDraw, etc.?
A: Yes, but you have to convert it to a bitmap (TIFF format).