合成图片+合成文字+图片

private void Form1_Load(object sender, EventArgs e)
        {
            Image backgroundImage = Image.FromFile(Environment.CurrentDirectory + @"\Template.JPG");

            var iamgeCompanyName = CreateText("北京红某某科技有限公司", false, 102);
            Bitmap bmp = CombinImage(backgroundImage, iamgeCompanyName, 0, 1280);

            var imageBrandName = CreateText("某某世纪", false, 95);
            bmp = CombinImage(bmp, imageBrandName, 0, 1545);

            var imageCycle = CreateText("二0一九年十四月", false, 90);
            bmp = CombinImage(bmp, imageCycle, 0, 2025);

            var imageSerialNum = CreateText("编号：8885559998", false, 45);
            bmp = CombinImage(bmp, imageSerialNum, 608, 578);

            Image cctvLogo = Image.FromFile(Environment.CurrentDirectory + @"\logo\l1.png");
            bmp = CombinImage(bmp, cctvLogo, 0, 2435);


            MemoryStream ms = new MemoryStream();
            bmp.Save(ms, ImageFormat.Png);

            string filePath = @"C:\迅雷下载\" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".png";

            FileStream file = new FileStream(filePath, FileMode.Create, System.IO.FileAccess.Write);
            file.Write(ms.ToArray(), 0, ms.ToArray().Length);
            file.Close();
            ms.Close();

            System.Diagnostics.Process.Start(filePath);
        }



        public void SaveImage(MemoryStream ms, string filePath)
        {
            FileStream file = new FileStream(filePath, FileMode.Create, System.IO.FileAccess.Write);
            file.Write(ms.ToArray(), 0, ms.ToArray().Length);
            file.Close();
            ms.Close();
        }

        /// <summary>
        /// 生成文字图片
        /// </summary>
        /// <param name="text"></param>
        /// <param name="isBold"></param>
        /// <param name="fontSize"></param>
        public Image CreateText(string text, bool isBold, int fontSize)
        {
            int wid = 400;
            int high = 200;

            PrivateFontCollection fontCollection = new PrivateFontCollection();
            fontCollection.AddFontFile(Environment.CurrentDirectory + @"\AdobeHeitiStd-Regular.otf");

            var r = fontCollection.Families[0].IsStyleAvailable(FontStyle.Regular);
            var b = fontCollection.Families[0].IsStyleAvailable(FontStyle.Bold);
            //定义成新的字体对象
            FontFamily myFontFamily = new FontFamily(fontCollection.Families[0].Name, fontCollection);
            Font font = new Font(myFontFamily, fontSize);
            if (isBold)
            {
                font = new Font(myFontFamily, fontSize, FontStyle.Bold);
            }
            //绘笔颜色
            SolidBrush brush = new SolidBrush(Color.Black);
            StringFormat format = new StringFormat(StringFormatFlags.NoClip);
            Bitmap image = new Bitmap(wid, high);
            Graphics g = Graphics.FromImage(image);

            SizeF sizef = g.MeasureString(text, font, PointF.Empty, format);//得到文本的宽高
            int width = (int)(sizef.Width + 1);
            int height = (int)(sizef.Height + 1);
            image.Dispose();
            image = new Bitmap(width, height);
            g = Graphics.FromImage(image);


            g.SmoothingMode = SmoothingMode.AntiAlias;
            g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;

            g.Clear(Color.Transparent);//透明

            RectangleF rect = new RectangleF(0, 0, width, height);
            //绘制图片
            g.DrawString(text, font, brush, rect);
            //释放对象
            g.Dispose();
            return image;
        }

        /// <summary>  
        /// 合并图片  
        /// </summary>  
        /// <param name="imgBack"></param>  
        /// <param name="img"></param>  
        /// <returns></returns>  
        public static Bitmap CombinImage(Image imgBack, Image img, int xDeviation = 0, int yDeviation = 0)
        {
            Bitmap bmp = new Bitmap(imgBack.Width, imgBack.Height);
            Graphics g = Graphics.FromImage(bmp);
            g.Clear(Color.White);
            g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height); //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);     
            g.DrawImage(img, imgBack.Width / 2 - img.Width / 2 + xDeviation, yDeviation, img.Width, img.Height);
            GC.Collect();
            return bmp;
        }

        /// <summary>  
        /// Resize图片  
        /// </summary>  
        /// <param name="bmp">原始Bitmap</param>  
        /// <param name="newW">新的宽度</param>  
        /// <param name="newH">新的高度</param>  
        /// <param name="mode">保留着，暂时未用</param>  
        /// <returns>处理以后的图片</returns>  
        public static Image ResizeImage(Image bmp, int newW, int newH, int mode)
        {
            try
            {
                Image b = new Bitmap(newW, newH);
                Graphics g = Graphics.FromImage(b);

                // 插值算法的质量    
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height),
                            GraphicsUnit.Pixel);
                g.Dispose();
                return b;
            }
            catch
            {
                return null;
            }
        }
    }