使组合图像保持透明背景

Question

我在使用下面的代码保持我创建的图像的透明度时遇到问题。组合图像始终是黑色而不是透明。这两个图像都是jpg。我看过其他类似的问题，但我无法找到解决问题的方法。

    public static string CombineImages(Image[] images, string directoryToSave, string imageName)
    {
        for (int i = 0; i < SpecialCharsToRemove.Length; i++)
        {
            while (imageName.Contains(SpecialCharsToRemove[i])) { imageName = imageName.Replace(SpecialCharsToRemove[i], ""); }
        }
        string finalImage = directoryToSave + "\\" + imageName;
        int height = 0;
        int width = 0;
        for(int i = 0; i < images.Length; i++)
        {
            if (height < images[i].Height) { height = images[i].Height; }
            width += images[i].Width;
        }

        using (Bitmap image = new Bitmap(width, height))
        {
            using (Graphics g = Graphics.FromImage(image))
            {
                g.Clear(Color.Transparent);
                width = 0;
                for (int i = 0; i < images.Length; i++)
                {
                    g.DrawImage(images[i], new Point(width, 0));
                    width += images[i].Width;
                }
                image.MakeTransparent(image.GetPixel(1, 1));
                image.Save(finalImage, ImageFormat.Jpeg);
            }
        }
        return finalImage;
    }