Travel through pixels in BMP

Question

Hi i have a bmp loaded to a BMP object and im required to travel though the pixels as the above image from (1,1) pixel to (100,100) px . using getpixel() method. I was using was ONE loop but it was not successful .

If im using the concept of multidimensional array what should be variable values ?

Answer 1

When you want to doing image processing on huge images GetPixel() method takes long time but I think my algorithm takes less time than other answers , for example you can test this code on 800 * 600 pixels image.

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Bitmap bmp = new Bitmap("SomeImage");  // Lock the bitmap's bits.   Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height); BitmapData bmpData = bmp.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);  // Get the address of the first line. IntPtr ptr = bmpData.Scan0;  // Declare an array to hold the bytes of the bitmap. int bytes = bmpData.Stride * bmp.Height; byte[] rgbValues = new byte[bytes]; byte[] r = new byte[bytes / 3]; byte[] g = new byte[bytes / 3]; byte[] b = new byte[bytes / 3];  // Copy the RGB values into the array. Marshal.Copy(ptr, rgbValues, 0, bytes);  int count = 0; int stride = bmpData.Stride;  for (int column = 0; column < bmpData.Height; column++) {     for (int row = 0; row < bmpData.Width; row++)     {         b[count] = (byte)(rgbValues[(column * stride) + (row * 3)]);         g[count] = (byte)(rgbValues[(column * stride) + (row * 3) + 1]);         r[count++] = (byte)(rgbValues[(column * stride) + (row * 3) + 2]);     } }