Graphics

public void ZoomImage(double ZoomFactor)<br />
{<br />
  zoomFactor = ZoomFactor;<br />
  pbImage.SizeMode = PictureBoxSizeMode.Zoom;<br />
  pbImage.Height = Convert.ToInt32(Math.Round(origHeight * ZoomFactor));<br />
  pbImage.Width = Convert.ToInt32(Math.Round(origWidth * ZoomFactor));<br />
  MaximumSize = new Size(pbImage.Width + 10, pbImage.Height + 30);<br />
  pbImage.Invalidate();<br />
}

<br />
// Create a new temporary bitmap to resize the original image<br />
// The size of this bitmap is the size of the picImage picturebox.<br />
Bitmap tempBitmap = new Bitmap(pbImage.Width, pbImage.Height, PixelFormat.Format32bppRgb);<br />
<br />
// Set the resolution of the bitmap to match the original resolution.<br />
tempBitmap.SetResolution(origionalImage.HorizontalResolution, origionalImage.VerticalResolution);<br />
<br />
// Create a Graphics object to further edit the temporary bitmap<br />
Graphics bmGraphics = Graphics.FromImage(tempBitmap);<br />
<br />
// Set the interpolationmode since we are resizing an image here<br />
bmGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;<br />
<br />
// Draw the original image on the temporary bitmap, resizing it using<br />
// the calculated values of targetWidth and targetHeight.<br />
bmGraphics.DrawImage(origionalImage, 0, 0, pbImage.Width, pbImage.Height);<br />
<br />
// Dispose of the bmGraphics object<br />
bmGraphics.Dispose();<br />
<br />
// Set the image of the picImage picturebox to the temporary bitmap<br />
pbImage.Image = tempBitmap;