New Post: MagickImage.Resample has no effect

I'm using the following code:

public static void InPlaceResample(string source, int width, int height)
{
    using (var image = new MagickImage(source))
    {
        image.Resample(width, height);
        image.Write(source);
    }
}

The method is intended to change only the DPI of an image, but when running through the debugger the ResolutionX and ResolutionY properties are not changed by calling Resample. Am I missing something?