I just uploaded The Photo Frame Program to the website. I use this program to copy digital photographs to my digital photo frame. The Photo Frame Program automatically scales the photos for my frame's native resolution.

By default, .NET scales Bitmaps quickly and less attractively. The Photo Frame Program performs high quality image scaling. Look at the SmoothingMode, PixelOffsetMode, CompositingQuality, and InterpolatingMode properties below:

using (Graphics gr = Graphics.FromImage(scaledBitmap))
using (Brush blackBrush = new SolidBrush(Color.Black))
{
  gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
  gr.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
  gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
  gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

  if (addMarginsCheckBox.Checked)
  {
    // Fill entire image with black.
    gr.FillRectangle(blackBrush, new Rectangle(new Point(0, 0), new Size(maxWidth, maxHeight)));
  }

  int xPos = 0;
  int yPos = 0;

  if (addMarginsCheckBox.Checked)
  {
    xPos = (maxWidth - scaleSize.Width) / 2;
    yPos = (maxHeight - scaleSize.Height) / 2;
  }

  // Draw scaled image into bitmap
  gr.DrawImage(originalBitmap, 
               new Rectangle(xPos, yPos, scaleSize.Width, scaleSize.Height), 
               new Rectangle(0, 0, originalBitmap.Width, originalBitmap.Height), GraphicsUnit.Pixel);
}

You can also browse this program's source code on-line.