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    <p>I took Daniel's answer and modified it for performance, by using BitmapData class, since using GetPixel/SetPixel is very expensive and inappropriate for performance-hungry systems. It works exactly the same as the previous solution and can be used instead.</p> <pre><code> public static Bitmap Sharpen(Bitmap image) { Bitmap sharpenImage = (Bitmap)image.Clone(); int filterWidth = 3; int filterHeight = 3; int width = image.Width; int height = image.Height; // Create sharpening filter. double[,] filter = new double[filterWidth, filterHeight]; filter[0, 0] = filter[0, 1] = filter[0, 2] = filter[1, 0] = filter[1, 2] = filter[2, 0] = filter[2, 1] = filter[2, 2] = -1; filter[1, 1] = 9; double factor = 1.0; double bias = 0.0; Color[,] result = new Color[image.Width, image.Height]; // Lock image bits for read/write. BitmapData pbits = sharpenImage.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb); // Declare an array to hold the bytes of the bitmap. int bytes = pbits.Stride * height; byte[] rgbValues = new byte[bytes]; // Copy the RGB values into the array. System.Runtime.InteropServices.Marshal.Copy(pbits.Scan0, rgbValues, 0, bytes); int rgb; // Fill the color array with the new sharpened color values. for (int x = 0; x &lt; width; ++x) { for (int y = 0; y &lt; height; ++y) { double red = 0.0, green = 0.0, blue = 0.0; for (int filterX = 0; filterX &lt; filterWidth; filterX++) { for (int filterY = 0; filterY &lt; filterHeight; filterY++) { int imageX = (x - filterWidth / 2 + filterX + width) % width; int imageY = (y - filterHeight / 2 + filterY + height) % height; rgb = imageY * pbits.Stride + 3 * imageX; red += rgbValues[rgb + 2] * filter[filterX, filterY]; green += rgbValues[rgb + 1] * filter[filterX, filterY]; blue += rgbValues[rgb + 0] * filter[filterX, filterY]; } int r = Math.Min(Math.Max((int)(factor * red + bias), 0), 255); int g = Math.Min(Math.Max((int)(factor * green + bias), 0), 255); int b = Math.Min(Math.Max((int)(factor * blue + bias), 0), 255); result[x, y] = Color.FromArgb(r, g, b); } } } // Update the image with the sharpened pixels. for (int x = 0; x &lt; width; ++x) { for (int y = 0; y &lt; height; ++y) { rgb = y * pbits.Stride + 3 * x; rgbValues[rgb + 2] = result[x, y].R; rgbValues[rgb + 1] = result[x, y].G; rgbValues[rgb + 0] = result[x, y].B; } } // Copy the RGB values back to the bitmap. System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, pbits.Scan0, bytes); // Release image bits. sharpenImage.UnlockBits(pbits); return sharpenImage; } </code></pre>
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