asp.net 加水印后不清晰 求解决办法
protected void Button1_Click(object sender, EventArgs e) { // 根据选中状态初始化值 float pos_t_x = 390.0f; float pos_t_y = 132.0f; float pos_b_x = 980.0f; float pos_b_y = 363.0f; if (RadioButton2.Checked == true) { pos_t_x = 430; pos_t_y = 125; pos_b_x = 970; pos_b_y = 380; } if (RadioButton3.Checked == true) { pos_t_x = 75; pos_t_y = 143; pos_b_x = 680; pos_b_y = 380; } string Filename =string.Empty; string file = Server.MapPath("") + "\\" + Label1.Text.Replace("/", "\\"); file = file.Replace("image", "card_bg"); file = file.Replace("_all", ""); System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append(DateTime.Now.Year.ToString()); sb.Append(DateTime.Now.Month.ToString()); sb.Append(DateTime.Now.Day.ToString()); sb.Append(DateTime.Now.Hour.ToString()); sb.Append(DateTime.Now.Minute.ToString()); sb.Append(DateTime.Now.Second.ToString()); sb.Append(".jpg"); Filename = sb.ToString(); //生成缩略图 //原始图片名称 //生成高质量图片名称 string strFile = Server.MapPath("~") + "/card/card_" + Filename; //从文件获取图片对象 //System.Drawing.Image image = System.Drawing.Image.FromStream(hpf.InputStream, true); System.Drawing.Image image = System.Drawing.Image.FromFile(@file); System.Drawing.Image bitmap = new System.Drawing.Bitmap(1024, 634); //新建bmp图片 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); //新建画板 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //制定高质量插值法 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //设置高质量、低速度呈现平滑程度 g.Clear(System.Drawing.Color.White); //清空画布 //在制定位置画图 g.DrawImage(image, new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height), new System.Drawing.Rectangle(0, 0, image.Width, image.Height), System.Drawing.GraphicsUnit.Pixel); int fontsize = 20; // 文字大小 // 抬头 //文字水印 System.Drawing.Graphics testGrahpics = System.Drawing.Graphics.FromImage(bitmap); System.Drawing.Text.PrivateFontCollection pfc = new System.Drawing.Text.PrivateFontCollection(); string fontpath = Server.MapPath("font/font.ttf");//相对于虚拟目录的字体文件路径 pfc.AddFontFile(fontpath); System.Drawing.Font font = new System.Drawing.Font(pfc.Families[0], fontsize); System.Drawing.Brush brush = new System.Drawing.SolidBrush(ColorTranslator.FromHtml("#E0DEDD")); //分行 string sInput ="尊敬的" + TextBox3.Text.Trim().ToString() + DropDownList1.SelectedItem.Text.ToString() + "："; //获取输入的水印文字 testGrahpics.DrawString(sInput, font, brush, pos_t_x, pos_t_y); fontsize = 14; // 写落尾--------------------------- testGrahpics = System.Drawing.Graphics.FromImage(bitmap); font = new System.Drawing.Font(pfc.Families[0], fontsize); sInput = TextBox4.Text.Trim().ToString() + "致"; //获取输入的水印文字 // 为了保证落尾右侧对其，需要重新计算其X初始坐标 pos_b_x = pos_b_x - (sInput.Length) *(5.0f + (float) fontsize); testGrahpics.DrawString(sInput, font, brush, pos_b_x, pos_b_y); testGrahpics.Dispose(); //保存缩略图c try { bitmap.Save(strFile, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (Exception ex) { Response.Write("保存缩略图失败" + ex.Message); } //释放资源 g.Dispose(); bitmap.Dispose(); image.Dispose(); Image1.ImageUrl = "/card/card_" + Filename; Image1.Visible = true; HyperLink1.NavigateUrl = "/card/card_" + Filename; }