Printing and photo production and image output requirements

Inkjet printing generally refers to outdoor advertising screen output, which outputs a large screen, such as the number of billboard screens next to the highway is the output of the inkjet printer. Output models are: NRU SALSA 3200, Choi Shen 3200, etc., generally the maximum width of 3.2 meters. The media used in inkjet printers is generally advertising cloth (commonly known as light box cloth). The ink uses oily ink. In order to ensure the persistence of the picture, the color of the screen is generally a bit darker than the color on the display. Its actual output image resolution generally only needs 30 - 45DPI (device resolution), the actual size of the screen is relatively large, there are more than 100 square meters of area.

The photo is generally used in the home, and the screen it outputs is generally only a few square meters in size. For example, the small advertisement screen used by manufacturers at the exhibition. Output models such as: HP5000, generally the maximum width of 1.5 meters. The media used in the photo machine is generally PP paper and light sheet, and the ink uses water-based ink. After the output image is finished, the film and the sampan plate are counted as finished products. The output resolution can reach 300-1200 DPI (they will have different types), and its color is relatively saturated and clear.

Below we briefly describe some simple requirements for making and exporting images in inkjet and photo.

1, size

The size of the inkjet image is the same as the actual required screen size. It is different from printing and does not require the “bleeding” part. Inkjet companies generally leave “white border” (usually 10 CM) when outputting pictures. You can negotiate with the inkjet output company, leaving a few centimeters of the side to use for "buttonholes". The price is calculated per square meter, so the screen size is in centimeters.

Photo output image does not need to "bleed", according to the actual size of the map can be.

2, image resolution requirements

Inkjet images are often very large, and we must understand the truth that “you don’t know the true colors of the mountains, but you are in this mountain”. If the big picture still uses the resolution of the print, it will be exhausting the computer. In fact, the resolution of the inkjet image is not dead standard. The following is the resolution that I personally used when making different sizes of inkjet images. It is for reference only (the image area is square meters):

More than 180 square meters (resolution dpi: 11.25), 30--180 square meters (resolution dpi: 22.5), 1-30 square meters (resolution dpi: 45).

Note: Because current inkjet printers use 11.25 DPI, 22.5 DPI, and 45 DPI as output resolutions, reasonable use of image resolution can speed up graphics.

Photo resolution is generally 72DPI, if the image is too large (such as when the PHOTOSHOP new image shows the actual size of the file size exceeds 400M), you can properly reduce the resolution, the file can be controlled within 400M.

3, image mode requirements

Inkjet uses the CMKY mode in a unified manner, and the use of the RGB mode is prohibited. Today's inkjet printers are all four-color inkjet printers. When printing, they should follow the printing standards. The inkjet company will adjust the screen color and sample size.

You can use either CMKY mode or RGB mode. Note that the red value in RGB is defined by CMKY, ie M=100 Y=100.

4, the black part of the image requirements

In the inkjet and photo images, a single black value is strictly forbidden, and C, M and Y colors must be added to form a mixed black. If it is big black, it can be made: C=50 M=50 Y=50 K=100. Especially when using the effects it brings in PHOTOSHOP, pay attention to changing the black part to four-color black, otherwise the black part will have crossbar on the screen, which will affect the overall effect.

5, image storage requirements

The inkjet and photo-realistic images are best stored in the TIF format. Note that the compressed format cannot be used.

Source: Design Art Network