C#: Change DPI of Image

changedpi.cs

var filename = @"--input--image--";
var targetfile = @"--output-image--";

using (var image = Image.FromFile(filename))
{
    // changing to 96 DPI
    var resolution = new byte[8] { 0, 0, 96, 0, 0, 0, 1, 0 };

    if (image.PropertyIdList.Contains(282))
    {
        var xResolution = image.GetPropertyItem(282);
        xResolution.Value = resolution;
        image.SetPropertyItem(xResolution);
    }
    if (image.PropertyIdList.Contains(283))
    {
        var yResolution = image.GetPropertyItem(283);
        yResolution.Value = resolution;
        image.SetPropertyItem(yResolution);
    }

    image.Save(targetfile, image.RawFormat);
}