Just something like this:
Bitmap myBitmap = (Bitmap)Bitmap.FromStream(new MemoryStream(m_ImageBuff, 0,
m_TotalImageBytes));
.....
g.DrawImage(myBitmap....);
pbVideo.Image = myBitmap;

But I would abandon the picturebox myself and just do this:
Graphics g = this.CreateGraphics();//this being a form
//insert code here to create color matrix
g.drawImage(myBitmap, .... )
g.Dispose();

That way you're cutting down on CPU usage a lot because you're cutting out 1
step by drawing straight to the form. I spent 4 years writing an imaging app
and only used 1 picturebox which was to display an image in the About
screen.

Hi Michael,

I have both methods working now:

// ColorMatrix approach - works!
//
m_bmpPicture = (Bitmap)Bitmap.FromStream(new MemoryStream(m_ImageBuff, 0,
m_TotalImageBytes));

if (m_bmpPicture.PixelFormat ==
System.Drawing.Imaging.PixelFormat.Format24bppRgb)
{
   m_gfxPicture.DrawImage(m_bmpPicture, m_rctPicture, 0, 0,
         m_bmpPicture.Width, m_bmpPicture.Height, GraphicsUnit.Pixel,
m_iaPicture);
}
else
{
   pbVideo.Image = m_bmpPicture;
}

Or...

// LockBits approach - works!
//
m_bmpPicture = (Bitmap)Bitmap.FromStream(new MemoryStream(m_ImageBuff, 0,
m_TotalImageBytes));

if (m_bmpPicture.PixelFormat ==
System.Drawing.Imaging.PixelFormat.Format24bppRgb)
{
   ConvertToRGB(ref m_bmpPicture);
}
pbVideo.Image = m_bmpPicture;

public static bool ConvertToRGB(ref Bitmap b)
{
   int width = b.Width;
   int height = b.Height;
   BitmapData data = b.LockBits(new Rectangle(0, 0, width, height),
   ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
   int offset = data.Stride - data.Width * 3;

   unsafe
   {
       byte* ptr = (byte*)data.Scan0;
       for (int y = 0; y < height; y++, ptr += offset)
       {
           for (int x = 0; x < width; x++, ptr += 3)
           {
               byte swap = ptr[0];
               ptr[0] = ptr[2];
               ptr[2] = swap;
           }
       }
   }
   b.UnlockBits(data);
   return true;

}

Both seem to run about the same speed but I haven't actually measured them
in any way.  My biggest problem now is I need to build the inital bitmap
faster.  I'm collecting the video data on one port and other telemetry data
on another port.

Thanks again for all your help,
Joe