I suggest you use Photoshop to do it. Of course, you can choose AI or CDR to do it. Don't worry about the size. More often, you should consider the resolution. Next, I will introduce you to the basic knowledge of spray painting.
Image resolution:
Spray-painted files are often very large. If the large screen still uses the printed resolution, then the computer simply can't afford it, and it is unnecessary. For example, Photoshop can't draw more than 31,111 pixels. However, there is no dead standard for inkjet resolution. The following is the resolution used when making inkjet images of different sizes, for example (the image area is square meters, you can draw according to the following requirements):
411 square meters or more (resolution: 11.16dpi) 4pixel/cm;
211-411 square meters (resolution: 12.7dpi) 5pixel/cm;
121-211m2 (resolution: 15.24dpi) 6pixel/cm;
81-111m2 (resolution: 17.78dpi) 7pixel/cm;
61-81m2 (resolution: 21.32dpi) 8pixel/cm;
31-61m2 (resolution: 22.86dpi) 9pixel/cm;
21-31m2 (resolution: 31.48dpi) 12pixel/cm;
21 square meters or less (resolution: 38.1dpi or above) 15pixel/cm;
note: when it affects the image mosaic, we need to cut the file, and errors will appear when the pixel/inch unit is an integer, but it is very accurate when the pixel/cm unit is an integer, because we are perfectionists.
the photo resolution is usually 72dpi. if the file is too large (for example, in Photoshop menu, the file size exceeds 411 megabytes when the image/image size shows the actual size), you can appropriately reduce the resolution and control the file within 411 megabytes.
storage format requirements:
it's best to store the inkjet and photo images in. tif format. If LZW Compression format is adopted, it's a good way. It can not only reduce the space and save the file transmission bandwidth, but also have no quality damage to the picture at all.
Note when exporting CorelDRAW:
When exporting bitmap, CorelDRAW software should not exceed 11111pixel, otherwise the picture will be squashed. At this time, you need to cut the picture, cutting one piece can't exceed 11111pixel, and you only need to cut three pieces at most. Because it exceeds 31111pixel, Photoshop can't handle files.
color mode requirements:
CMKY mode is used uniformly in inkjet printing, and RGB mode is prohibited. At present, all the modes supported by inkjet printers are CMYK mode, but if you use RGB mode to make drawings and then switch to CMYK mode, the color will change, most obviously yellow. After the yellow of RBG mode is changed to CMYK mode, the yellow will be cyan, so the sprayed yellow will turn green, and other colors will also change, because the imaging principle of ink and display screen is completely different, which determines that RGB mode can not be displayed completely in CMYK mode. Therefore, inkjet printing and photo-taking still try to adopt CMYK mode. Therefore, when drawing, we should follow the CMYK standard. The photo should also use CMKY mode. And if you have special requirements on colors (such as standard colors, etc.), you need to provide us with a color matching draft, and we will adjust the color of the picture, which is close to the requirements of the black part of the sample
:
Monochrome black (C=1 M=1 Y=1 K=111) is strictly prohibited in painting and photo-taking, and four-color black must be composed of C, M, Y and K.. For example, Photoshop's default black color (C=75 M=68 Y=67 K=91), otherwise, the black part of the inkjet screen will have a horizontal bar, and the monochrome black will be grayed out, which will affect the overall effect.