Inkjet generally refers to the output of outdoor advertising pictures, and the pictures it outputs are very large. For example, many billboard pictures next to the highway are the result of the inkjet machine output. The output models are: NRU SALSA 3200, Caishen 3200, etc., generally with a maximum width of 3.2 meters. The media used in the inkjet printer is generally advertising cloth (commonly known as light box cloth), and the ink uses oily ink. In order to ensure the durability of the picture, the inkjet company generally has a darker color than the color on the display. The actual output image resolution generally only needs 30-45DPI (device resolution), the actual size of the screen is relatively large, with an area of ​​hundreds of square meters.
Photographs generally refer to indoor use, and the pictures it outputs are generally only a few square meters in size. Such as small screens of advertisements used by manufacturers at exhibitions. The output model such as HP5000 is generally a 1.5-meter maximum width photo machine. The media used is generally PP paper and lamp sheets, and the ink uses water-based ink. After the output image is finished, it needs to be covered with film and board to be finished. The output resolution can reach 300-1200DPI (different models will have different), and its color is relatively saturated and clear.
Below we briefly introduce some simple requirements for making and outputting images in inkjet and photo shoot.
1. Size
The size of the inkjet image is the same as the actual required screen size. It is different from printing, and there is no need to leave a "bleeding" part. Inkjet companies generally leave "white borders" (typically 10CM) when outputting pictures. You can agree with the inkjet output company, how many centimeters of the edge are left for "buttonholes". The price is calculated per square meter, so the screen size is in centimeters.
The photo output image does not need to "bleed", just make the picture according to the actual size.
2. Image resolution requirements
The painted images are often very large, and it is necessary to understand the principle of "I don't know the true face of Lushan, but only in this mountain". If the large screen still uses the printed resolution, then the computer will be exhausted. In fact, the resolution of the inkjet image is not a dead standard. The following is the resolution I used to make inkjet images of different sizes, for reference only (the image area is square meters):
180 square meters or more (resolution dpi: 11.25), 30--180 square meters (resolution dpi: 22.5), 1-30 square meters (resolution dpi: 45)
Note: Because most current inkjet printers use 11.25DPI, 22.5DPI and 45DPI as output resolutions, the reasonable use of image resolution can speed up the speed of drawing.
The photo resolution is usually 72DPI. If the image is too large (such as the file size exceeds 400M when PHOTOSHOP creates a new image to display the actual size), you can appropriately reduce the resolution and control the file within 400M.
3. Image mode requirements
CMKY mode is uniformly used for inkjet printing, and RGB mode is prohibited. The current inkjet printers are all four-color inkjets. When drawing, you must follow the printing standards. The inkjet company will adjust the color of the screen to be close to the sample.
The photo can use either CMKY mode or RGB mode. Note that the value of red in RGB is defined by CMKY, that is, M = 100 Y = 100.
4. Requirements for the black part of the image
It is strictly forbidden to have a single black value in the inkjet and photo images. It must be filled with C, M, and Y colors to form a mixed black. If it is big black, it can be made as follows: C = 50 M = 50 Y = 50 K = 100. Especially when using the effects brought by PHOTOSHOP, pay attention to changing the black part to four-color black, otherwise there will be horizontal lines on the black part of the screen, affecting the overall effect.
5. Image storage requirements
It is best to save the inkjet and photo images in TIF format. Note that the compressed format is not available.
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