moireilmiöistä

The moiré phenomenon, or moiré effect, is a visual pattern that emerges when two similar, typically geometric, patterns are superimposed, or when one pattern is placed over another at an angle. This superimposition creates a new, often larger-scale pattern that is not present in either of the original patterns individually. The resulting moiré pattern can appear as wavy lines, concentric circles, or more complex geometric shapes depending on the nature and orientation of the underlying patterns.

This optical illusion arises from the interference between the two superimposed patterns. When the lines or elements of the two patterns align closely but not perfectly, small variations in their spacing or alignment lead to constructive and destructive interference, making the new pattern visible. The moiré effect is commonly observed in everyday situations such as looking through two closely spaced screens or fences, or when viewing a finely patterned fabric with another patterned surface. It is also a significant consideration in digital imaging and printing, where it can manifest as unwanted artifacts if not properly managed. For instance, in digital photography, photographing screens or finely detailed textiles can sometimes produce moiré patterns. In printing, if halftones are not properly angled, moiré patterns can appear in the final printed image. Understanding and controlling the moiré effect is crucial in fields ranging from graphic design and textile manufacturing to scientific imaging and engineering.