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POSharpen on a Bitmap using C#
 

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    <p>I want to put a sharpen filter on an image. I have found a web <a href="http://www.student.kuleuven.be/~m0216922/CG/filtering.html" rel="noreferrer">with short tutorial</a>. I tried to do it in C# so here is my code. Anyway, I tried to find out why it is not working. I do not know if I am doing something wrong, if yes, please advise me what to do to make it work as it should be. Thanks</p> <pre><code> public static Bitmap sharpen(Bitmap image) { Bitmap sharpenImage = new Bitmap(image.Width, image.Height); int filterWidth = 3; int filterHeight = 3; int w = image.Width; int h = image.Height; 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]; for (int x = 0; x &lt; w; ++x) { for (int y = 0; y &lt; h; ++y) { double red = 0.0, green = 0.0, blue = 0.0; Color imageColor = image.GetPixel(x, y); for (int filterX = 0; filterX &lt; filterWidth; filterX++) { for (int filterY = 0; filterY &lt; filterHeight; filterY++) { int imageX = (x - filterWidth / 2 + filterX + w) % w; int imageY = (y - filterHeight / 2 + filterY + h) % h; red += imageColor.R * filter[filterX, filterY]; green += imageColor.G * filter[filterX, filterY]; blue += imageColor.B * 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); } } } for (int i = 0; i &lt; w; ++i) { for (int j = 0; j &lt; h; ++j) { sharpenImage.SetPixel(i, j, result[i, j]); } } return sharpenImage; } </code></pre>
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    1. COThere is interesting chapter of "Beautiful code" written by Charles Petzold named "On-the-Fly Code Generation for Image Processing". You may find it very useful.
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