[C#] ขอโค้ดหรือคำแนะนำ ลดขนาดของ GIF ด้วยภาษา C# หน่อยครับ

public static void Main()
{
    var image = Image.FromFile(@"c:\logo.png");
    var newImage = ScaleImage(image, 300, 400);
    newImage.Save(@"c:\test.png", ImageFormat.Png);
}

public static Image ScaleImage(Image image, int maxWidth, int maxHeight)
{
    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.FromImage(newImage).DrawImage(image, 0, 0, newWidth, newHeight);
    return newImage;
}