New Post: Resize is not working properly

I am trying to resize (shrink) a .tiff image. The resize is not working properly. It's cropping the image, not resizing it. What is wrong with this code here?

        MagickImage NewImage = new MagickImage(strTempFile);
        NewImage.Resize(750, 256);
        NewImage.Format = MagickFormat.Tiff;
        NewImage.Write(strFileName);

The before is https://boomerangdm.com/Before.tif
The after is https://boomerangdm.com/After.tif