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    <p>You need to compare the <code>ARGB</code> values of color</p> <pre><code>Dim cw As New Color cw = Color.Black dim curPixColor as Color = b.GetPixel(x, y) If curPixColor.ToArgb = cw.ToArgb Then nii.SetPixel(x, y, Color.Red) End If </code></pre> <p>Or you should use the Equality Operator</p> <pre><code>Dim cw As New Color cw = Color.Black dim curPixColor as Color = b.GetPixel(x, y) If Color.op_Equality(curPixColor, cw) Then nii.SetPixel(x, y, Color.Red) End If </code></pre> <p>Reference:<a href="http://msdn.microsoft.com/en-us/library/system.drawing.color.op_equality(v=vs.110).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.drawing.color.op_equality(v=vs.110).aspx</a></p> <p>Edit: As you are getting pixel from a bmp there is no transparency supported. so your comparing color should be</p> <pre><code>cw = Color.FromArgb(0,0,0,0) </code></pre> <p><strong>Edit2</strong>: you are reading pixed from <code>nii</code> you should be reading from <code>b</code></p> <pre><code>dim curPixColor as Color = b.GetPixel(x, y) </code></pre> <p>full code should be something like (tested)</p> <pre><code> Dim b As Bitmap = New Bitmap("D:\test.bmp") ' Make Image Indexed Dim nii As New Bitmap(b.Width, b.Height, System.Drawing.Imaging.PixelFormat.Format32bppPArgb) For y As Integer = 0 To nii.Height - 1 For x = 0 To nii.Width - 1 Dim cw As New Color cw = Color.Black Dim curPixColor As Color = b.GetPixel(x, y) If curPixColor.ToArgb() = cw.ToArgb() Then nii.SetPixel(x, y, Color.Red) Else nii.SetPixel(x, y, curPixColor) End If Next Next PictureBox1.Image = Image.FromFile("D:\test.bmp") PictureBox2.Image = nii </code></pre>
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    1. POHow do I get the color of a pixel at X,Y using vb.net
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    1. POHow do I get the color of a pixel at X,Y using vb.net
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    1. COi tried it but it dosen't work again i tried both solution !! :(
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      1. USKartik Shah
    2. COwhat are you getting? any error messages?
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    3. COno error message nothing i got it continued its process and when debug i seen that control does not enter in if condition when condition becomes true..
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      1. USKartik Shah
 

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