I have a source bitmap that is 1x1 and I am trying to take that image and draw it to a new bitmap. The source bitmap is all red, but for some reason the new bitmap ends up with a gradient (see image). Using the code below, shouldn't the new bitmap be completely red? Where is it getting the white/alpha from?

private void DrawImage()
{
    Bitmap bmpSOURCE = new Bitmap(1, 1, PixelFormat.Format32bppArgb);
    using (Graphics g = Graphics.FromImage(bmpSOURCE))
    {
    	g.Clear(Color.Red);
    }

    Bitmap bmpTest = new Bitmap(300, 100, PixelFormat.Format32bppArgb);
    using (Graphics g = Graphics.FromImage(bmpTest))
    {
    	g.CompositingMode = CompositingMode.SourceCopy;
    	g.CompositingQuality = CompositingQuality.AssumeLinear;
    	g.InterpolationMode = InterpolationMode.HighQualityBicubic;
    	g.PageUnit = GraphicsUnit.Pixel;
    	g.PixelOffsetMode = PixelOffsetMode.None;
    	g.SmoothingMode = SmoothingMode.None;

    	Rectangle rectDest = new Rectangle(0, 0, bmpTest.Width, bmpTest.Height);
    	Rectangle rectSource = new Rectangle(0, 0, 1, 1);
    	g.DrawImage(bmpSOURCE, rectDest, rectSource, GraphicsUnit.Pixel);
    }

    pictureBox1.Image = bmpTest;
}