Moire

Moiré refers to a pattern of interference that occurs when two regular grids or repetitive patterns overlap, resulting in a secondary, often distracting pattern. In printing, moiré patterns typically appear when halftone screens or patterns misalign during the printing process, causing unwanted visual artifacts.

Synonym

Moiré Pattern

Examples

• Printed Images: Moiré patterns can emerge in printed images when the screen angles of halftone dots used for color separation clash, creating a wavy or distorted effect.

• Digital Scanning: When scanning images with fine repetitive textures, such as fabrics or intricate designs, moiré can appear due to the interaction between the scanner’s grid and the image pattern.

• Graphic Design: Designers may encounter moiré effects when overlaying patterns or textures in digital design projects, especially if the patterns are not properly aligned.

Recommendations

1. Screen Angles: Use different screen angles and appropriate screen rulings during the printing process to minimize the risk of moiré patterns.
2. Pre-Press Adjustments: Implement moiré reduction techniques in pre-press software to detect and adjust potential moiré issues before printing.
3. Image Resolution: Ensure high-resolution scans and images to reduce moiré effects and consider using descreening filters during image processing to smooth out unwanted patterns.