8bit BPP is loaded as Format32bppArgb in C #

I have a raw 8 bit BPP TIF file when I do this:

Bitmap imag = new Bitmap(imgN)

      

        
        
        
      

    

then:

imag.PixelFormat.ToString()

      

        
        
        
      

    

I am getting Format32bppArgb where I should get 8 bits,

I tried to do:

AForge.Imaging.Image.Clone(imag, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);

      

        
        
        
      

    

but i get

An unhandled exception of type "System.Exception" occurred in System.Drawing.dll Additional information: A Graphics object could not be created from an indexed pixel format image.

Perhaps I need to load it first into a byte array and then into a bitmap?