C#, convert image to grayscale

Question

Is there a way to convert an image to grayscale 16pixels per bit format, rather than setting each of the r,g and b components to luminance. I currently have a bmp from file.

Bitmap c = new Bitmap("filename");

I want a Bitmap d, that is grayscale version of c. I do see a consructor that includes System.Drawing.Imaging.PixelFormat, but I don't understand how to use that. I'm new to Image Processing and the relevant C# libraries, but have a moderate experience with C# itself.

Any help, reference to an online source, hint or suggestion will be appreciated.

Thank you.

EDIT: d is the grayscale version of c.

Answer 1

Try this example: Convert color to grayscale

Answer 2

"I want a Bitmap d, that is grayscale. I do see a consructor that includes System.Drawing.Imaging.PixelFormat, but I don't understand how to use that."

Here is how to do this

Bitmap grayScaleBP = new 
         System.Drawing.Bitmap(2, 2, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale);

EDIT: To convert to grayscale

             Bitmap c = new Bitmap("fromFile");
             Bitmap d;
             int x, y;

             // Loop through the images pixels to reset color.
             for (x = 0; x < c.Width; x++)
             {
                 for (y = 0; y < c.Height; y++)
                 {
                     Color pixelColor = c.GetPixel(x, y);
                     Color newColor = Color.FromArgb(pixelColor.R, 0, 0);
                     c.SetPixel(x, y, newColor); // Now greyscale
                 }
             }
            d = c;   // d is grayscale version of c  

Answer 3

Bitmap d = new Bitmap(c.Width, c.Height);

for (int i = 0; i < c.Width; i++)
{
    for (int x = 0; x < c.Height; x++)
    {
        Color oc = c.GetPixel(i, x);
        int grayScale = (int)((oc.R * 0.3) + (oc.G * 0.59) + (oc.B * 0.11));
        Color nc = Color.FromArgb(oc.A, grayScale, grayScale, grayScale);
        d.SetPixel(i, x, nc);
    }
}

This way it also keeps the alpha channel.
Enjoy.