CDR design, or PS, or AI. Both will do. However, the printing size of A4 is different from the actual size, it is 2 10X285, and the color should be CMYK. I usually send CDR files to the printing factory to print leaflets, and try to store the lower version before sending them. Remember to turn the song. Qualified design software generally includes CorelDraw, PS, AI and other software. CorelDraw should be saved in CDR format 8.0 or 14.0, and PS should be designed as jpg. Format, ai design in AI or eps format, and the format is 10. Use the correct C.M.Y.K print color mode, and don't use RGB or other color wheels to represent colors. Please use monochrome black (c: 0; Male: 0; y:0； K: 100), otherwise it is easy to appear ghosting. The line setting is not less than 0. 1mm, otherwise printing will not occur.

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