string imgPath = @"C:HM01000001400001-01 青龙 白虎.tif"; Image img = Image.FromFile(imgPath); Bitmap tmpbitmap = new Bitmap(img); img = tmpbitmap; string savePath = Path.Combine(Path.GetDirectoryName(imgPath), Path.GetFileNameWithoutExtension(imgPath) + "sl.jpg"); //可以选择格式 img.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg);