What is Descreening and when do you use it?ĭescreen is used only for images in printed matter, and not for real photo images. Change the camera focal length: Changing the focus of the camera will adjust the resolution of the photo, thus changing the overlay patterns.Change the camera angle: Changing the angle of the camera itself will adjust the way the 2 contrasting patterns overlap.It is affected by lens sharpness, the sensor’s anti-aliasing (lowpass) filter (which softens the image), and demosaicing software. Traditional procedures to eliminate moiré patterns often include scanning at 2X or more the desired resolution, apply a blur or despeckle filter, resample to half size to get the desired final size, then use a sharpening filter.Ĭolor moiré is an artificial color banding that can appear in images with repetitive patterns of high spatial frequencies, like fabrics or picket fences – or your computer screen. 2 What is Descreening and when do you use it?.1 How do I remove moiré pattern from scanned photos?.
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March 2023
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