Bildgröße im Verhältnis verändern (Interpoliert)

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/// <summary>
/// Resizes the pic by width.
/// </summary>
/// <param name="sourceImage">The source image.</param>
/// <param name="newWidth">The new width.</param>
/// <returns></returns>
private static Bitmap ResizePicByWidth(Image sourceImage, double newWidth)
{
    double sizeFactor = newWidth/sourceImage.Width;
    double newHeigth = sizeFactor*sourceImage.Height;
    Bitmap newImage = new Bitmap((int) newWidth, (int) newHeigth);
    using (Graphics g = Graphics.FromImage(newImage))
    {
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
        g.DrawImage(sourceImage, new Rectangle(0, 0, (int) newWidth, (int) newHeigth));
    }
    return newImage;
}