Redimensionando Imagem

Question

Galera estou redimensionando minha imagem, mas está distorcendo. Como posso salva la com a mesma qualidade da original ?

Segue o método que fiz :

public string CreateThumbnail(int maxWidth, int maxHeight, string path)
        {

            var image = System.Drawing.Image.FromFile(path);
            var ratioX = (double)maxWidth / image.Width;
            var ratioY = (double)maxHeight / image.Height;
            var ratio = Math.Min(ratioX, ratioY);
            var newWidth = (int)(image.Width * ratio);
            var newHeight = (int)(image.Height * ratio);
            var newImage = new Bitmap(newWidth, newHeight);
            Graphics thumbGraph = Graphics.FromImage(newImage);

            thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
            thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
            thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
            


            thumbGraph.DrawImage(image, 0, 0, newWidth, newHeight);
            image.Dispose();


            string fileRelativePath = "novaImagem_" + Path.GetFileName(path);
            newImage.Save(Path.GetDirectoryName(path) +"\\"+ fileRelativePath, newImage.RawFormat);
            return Path.GetDirectoryName(path) + "\\" + fileRelativePath;
        }

Obrigado

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SirSmart