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Get RGB from pixel via image buffer

Lee Wade

Hi, I am new to C# and im working on image processing, im using this bit of code to invert the pixels on an image, how do I extract the RGB values from a pixel in C# using the image buffer?

Thanks.

unsafe
{
    byte* p = (byte *)(void *)pBuffer;
    int nWidth = Width * 3;
    for(int y = 0; y < Height; y++)
    {
      for(int x = 0; x < nWidth; x++ )
       {
         p[0] = (byte)(255-p[0]);
         p++;

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Dave18y ago
Try something like this:

Color col = new Color();
Bitmap pic = // code to get the bitmap - perhaps an OpenFileDialog

col = pic.GetPixel(e.X, e.Y);

SomeTextBox1.Text = col.R.ToString();
SomeTextBox2.Text = col.G.ToString();
SomeTextBox3.Text = col.B.ToString();