In a 3x3 window, subtracting (right-left) and (bottom-top) is one way to do this. The usual way to do this is through a pair of edge detection filters that compute horizontal and vertical gradient. For each pixel in the original image, the gradient map encodes a vector that indicates the direction and rate of fastest ascent in luminance. Compute a gradient map from the grayscale image.Convert the original channel to grayscale.I don't remember how the original code worked, but here's one way to implement such an algorithm: I think, that Warpsharp would be a great addition for upscaled images especially when the ingame render resolution is lower than the output resolution: The basic "warp sharp" algorithm Warp sharp is the name of an algorithm that I originally found coded as a filter for an image editing application called "The GIMP." It's based on the idea that if you can identify the edges in an image, you can warp the image to shrink the edges and thus make them appear sharper. Or is there a similar shader already existing? Is there anyone whe ants to re-create the famous avisynth WarpSharp Shader for Reshade.
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