The Moiré point, also known as the Moiré pattern, is a visual effect that occurs when two regular grids or patterns are overlaid at a slight angle or have slightly different periods. It produces a distinctive pattern of apparent irregularities, often seen in printed materials, textiles, or electronic displays. The phenomenon arises from the interference between the two patterns, creating areas of constructive and destructive interference. In practical terms, Moiré patterns can be used to detect minute misalignments or imperfections in printing processes, but they can also be an unwanted artifact in digital imaging and display technologies. Their appearance and characteristics depend on the properties of the two overlaid patterns, such as their spatial frequency, orientation, and phase relationship. Overall, Moiré patterns are intriguing visual phenomena with practical applications in various field

The Moiré effect occurs when two regular patterns, often grids or lines, are overlaid with a slight misalignment or difference in scale. This creates interference patterns that give the illusion of irregularities or new patterns emerging. The phenomenon is a result of the interaction between the two patterns, where certain areas experience constructive interference, enhancing the visibility of the patterns, while other areas experience destructive interference, leading to apparent gaps or distortions.

In print, Moiré patterns can occur when printing screens (halftone dots) or line screens (grid of lines) are misaligned with each other or with the printing substrate. In digital imaging, Moiré patterns can appear when a digital sensor (such as a camera sensor) captures a scene with fine repetitive patterns, like textiles or architectural structures, and these patterns interact with the sensor's grid of pixels.

The appearance of Moiré patterns depends on various factors including the angle and scale of the overlaid patterns, their spatial frequency, and their phase relationship. Adjusting these parameters can sometimes mitigate or exacerbate the Moiré effect.

In practical terms, Moiré patterns can be both useful and undesirable. They can be used as a tool for detecting alignment issues in printing processes or for creating artistic effects in design. However, they can also be an unwanted artifact in digital imaging, causing distortion and reducing image clarity. Techniques such as anti-aliasing filters or optical low-pass filters are often employed in digital imaging systems to reduce the occurrence of Moiré patterns.