public void TestAddTextWalterMark_Png_Small()
        {
            string srcImage = @"C:\Users\suzhong\Desktop\New folder\Untitled.png";
            string outPath  = @"C:\Users\suzhong\Desktop\New folder";
            string srcText  = "Chinese American Civic Association";

            WaterMark walterMark = new WaterMark(srcImage, srcText, outPath);

            walterMark.ShortText = "咔咔华人社区";
            var outImage = walterMark.AddTextWalterMark();
        }