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Hi, This probably something of an edge case as it's not often you'd want to blur and sharpen the same image, but here goes... Open an image, apply a Gaussian Blur layer effect (I set the blur to around 0.8px and checked Preserve Alpha): Apply a High Pass Live Filter. Adjust radius to bring out contrast. A black border starts to appear around the image, increasing in thickness as the radius is increased: Set blend mode of live filter to Soft Light (Overlay, Hard Light, Vivid Light will also work): Close live filter dialog, zoom in and out of image. Transient rectangles with borders of various thicknesses come and go across the image: Select the image layer and Merge Visible: Yikes. I've attached the .afphoto doc. It appears to happen with any image, in both release (1.8.6) and beta versions of Photo. I'm running macOS 11.0.1 Big Sur. Cheers, H yikes.afphoto