The main causes of Moire include pattern interference during the rescanning of printed images or improper Screen Angle adjustment during color separation. If the dot patterns of all four CMYK colors are not set to standard angles (such as 45, 75, 0, 15 degrees), the undesirable Moire pattern is created instead of the desired Rosette pattern, clearly reducing visual quality.

Prepress teams can trace this error using specialized software and dot analysis tools during the RIP stage. The most critical prevention method is checking the Screen Angle in print files and confirming that no repetitive elements in the design interfere with the printing dots. Furthermore, analyzing the material's pattern is essential for sensitive prints, as the texture of fabric or embossed packaging can also be a Moire factor.