How to convert texture2D to image in C#

Hello, I am trying to use Aforge for Computer Vision with the unity webcam. I need to turn a texture2D into a C# image file, and I don't know how to do it. Based on some looking aroudn the net, I wrote the following functions. However, I am apparently missing a dll: gdiplus.dll , which I am starting to think doesn't exist on the OSX operating system. How else can I convert texture2D into an Image?

And I am surprised there isn't some code already available to do this.

 # region texture2image 
 public static System.Drawing.Image Texture2Image(Texture2D texture)
 {
   if (texture == null)
   {
       return null;
   }
   //Save the texture to the stream.
   byte[] bytes = texture.EncodeToPNG();
 
    //Memory stream to store the bitmap data.
   MemoryStream ms = new MemoryStream(bytes);
 
   //Seek the beginning of the stream.
   ms.Seek(0, SeekOrigin.Begin);
 
   //Create an image from a stream.
   System.Drawing.Image bmp2 = System.Drawing.Bitmap.FromStream(ms);
 
   //Close the stream, we nolonger need it.
   ms.Close();
   ms = null;
   
   return bmp2;
 }
 #endregion





 # region image2texture 
 public static Texture2D Image2Texture(System.Drawing.Image im)
 {
     if (im == null)
       {
           return new Texture2D(4,4);
       }
 
 
       //Memory stream to store the bitmap data.
       MemoryStream ms = new MemoryStream();
 
     
       //Save to that memory stream.
       im.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
     
        //Go to the beginning of the memory stream.
       ms.Seek(0, SeekOrigin.Begin);

       //make a new Texture2D
       Texture2D tex = new Texture2D(im.Width, im.Height);
      
       tex.LoadImage(ms.ToArray());
               
       //Close the stream.
       ms.Close(); 
       ms = null;
 
       //
       return tex;
 }
 #endregion