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  1. PO
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    <p>Ok, let's see what we can do - a quick Google found <a href="http://www.copypastecode.com/68220/" rel="nofollow noreferrer">this</a>, which can be simply adapted to your function something like this</p> <pre><code>private Bitmap SobelEdgeDetect(Bitmap original) { int width = original.Width; int height = original.Height; int BitsPerPixel = Image.GetPixelFormatSize(original.PixelFormat); int OneColorBits = BitsPerPixel / 8; BitmapData bmpData = original.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, original.PixelFormat); int position; int[,] gx = new int[,] { { -1, 0, 1 }, { -2, 0, 2 }, { -1, 0, 1 } }; int[,] gy = new int[,] { { 1, 2, 1 }, { 0, 0, 0 }, { -1, -2, -1 } }; byte Threshold = 128; Bitmap dstBmp = new Bitmap(width, height, original.PixelFormat); BitmapData dstData = dstBmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, dstBmp.PixelFormat); unsafe { byte* ptr = (byte*)bmpData.Scan0.ToPointer(); byte* dst = (byte*)dstData.Scan0.ToPointer(); for (int i = 1; i &lt; height - 1; i++) { for (int j = 1; j &lt; width - 1; j++) { int NewX = 0, NewY = 0; for (int ii = 0; ii &lt; 3; ii++) { for (int jj = 0; jj &lt; 3; jj++) { int I = i + ii - 1; int J = j + jj - 1; byte Current = *(ptr + (I * width + J) * OneColorBits); NewX += gx[ii, jj] * Current; NewY += gy[ii, jj] * Current; } } position = ((i * width + j) * OneColorBits); if (NewX * NewX + NewY * NewY &gt; Threshold * Threshold) dst[position] = dst[position + 1] = dst[position + 2] = 255; else dst[position] = dst[position + 1] = dst[position + 2] = 0; } } } original.UnlockBits(bmpData); dstBmp.UnlockBits(dstData); return dstBmp; } </code></pre> <p>It's not complete copy/paste solution but you should be able to see how the original author is accessing the pixel data by using <code>LockBits</code> in exactly the way you need. The rest is up to you ;-)</p> <p>You will need to set the <code>unsafe</code> option in your project properties as I explained in <a href="https://stackoverflow.com/a/16632698/2065121">my answer</a> to your previous question.</p>
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    1. POEdge Detection with Lockbits C#
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    1. USCommunity
    1. USRoger Rowland
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      1. VTUpMod
    1. COokay, i will try it. thanks
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      1. USchrist2702
    2. COfinally, i can implement it. but, i always get the 'white' color instead of 'transparent'. can you help me how to fix this? i want to use Color.Transparent in the image result
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