In printing, the undesired interference patterns that appear in overlapping lines and dots are called the Moiré effect. The printed image and the screen pattern interact, leading to an interference pattern. Lower frequency screens (or stochastical screens) also help reduce the Moiré effect.
When you scan a halftone picture using a digital scanner, you can also get the Moiré effect. Because of this, the pixels on the screen don’t exactly match the scan lines from the scanner. One solution is to reduce the effects of moire patterning by deploying high-res scanning equipment. However, one might also run images in filtering software to de-screen for such aberrations.
In printmaking, a moiré is an unwanted interference pattern caused by the superimposition of two grids. This can arise due to improper placement of the monitor or movie produced while making the print or placement of the paper during printing.
Moiré effects can be further produced whenever scanner devices scan a halftone picture using a non-halftone raster. The resultant image will exhibit a moiré pattern due to this misalignment.
Moiré can be minimized or eliminated by using a higher line count screen, by rotating the screen a little bit in relationship to the film or paper or film/paper, or by using a scanner that has an arrangement of pixels aligned with the halftone lattice, for example.
Moiré is a vital process in printing that enables the production of premium prints with vivid and varied color ranges. This type of printing has high resolution and accurate color and is commonly used for printing photos or other intricate images in which color precision is important. They’re also fade-resistant (to a greater extent than regular prints) and robust — good attributes when trying to achieve long-lasting prints.
