谁知道怎么给上传的图片加水印？

当我用 c# 写的组件上传一张图片的时候，我要在图片的底部加上 “上传者某某”
有谁知道怎么做吗？

解决方案 »

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<%@ Page Language="c#" Debug="true" Trace="true"%>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<html>
<script runat =server>
      void UploadBtn_Click(Object sender, EventArgs e) {
         String filename;
         String filename1;
         String[] filename2;
         int q;
         filename=UploadFile.PostedFile.FileName ;
         filename2=filename.Split(new Char[] {'\\'});
         q=filename2.GetUpperBound(0);
         filename1=filename2[q];
         dis.Text="上传文件名："+filename1+"<br/>";
         UploadFile.PostedFile.SaveAs(Server.MapPath(filename1));
         ImageEditor.Visible = true;
         dis.Text+="文件大小："+UploadFile.PostedFile.ContentLength+"字节数";
         Image1.Src=filename1;
      }
      void UpdateBtn_Click(Object sender, EventArgs e) {
         String filename1;
         filename1=Image1.Src;
         System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath(filename1));
         System.Drawing.Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRGB);
         Graphics g = Graphics.FromImage(newimage);
         g.DrawImage(image,0,0,image.Width,image.Height);
         Font f = new Font(FontType.SelectedItem.Text, Int32.Parse(FontSize.SelectedItem.Text));
         Brush b = new SolidBrush(Color.Red);
         g.DrawString(Caption.Text, f, b, 10, 140);
         g.Dispose();
         System.Drawing.Image thumbImage = newimage.GetThumbnailImage(Int32.Parse(Width.Text),Int32.Parse(Height.Text),null,0);
         image.Dispose();
         thumbImage.Save(Server.MapPath(filename1), ImageFormat.JPEG);
         Image1.Src=filename1;
         Caption.Text="";

      }   </script>   <body>
   <asp:label id="dis" runat=server/>
     <form enctype="multipart/form-data" runat=server>          <h3>          Select File To Upload: <input id="UploadFile" type=file runat=server>          <asp:button Text="Upload Me!" OnClick="UploadBtn_Click" runat=server/>          <hr>

          <asp:panel id="ImageEditor" Visible=false runat=server>             <img ID="Image1" src="" runat="server"/>             <h3>
                Image Width: <asp:textbox id="Width" runat=server/>                 Image Height: <asp:textbox id="Height" runat=server/> <br/>                 Text Caption: <asp:textbox id="Caption" runat=server/>                 Caption Size: <asp:dropdownlist id="FontSize" runat=server>
                                         <asp:listitem>14</asp:listitem>
                                         <asp:listitem>18</asp:listitem>
                                         <asp:listitem>26</asp:listitem>
                                         <asp:listitem>36</asp:listitem>
                                         <asp:listitem>48</asp:listitem>
                                         <asp:listitem>62</asp:listitem>
                                      </asp:dropdownlist>
                 Caption Font: <asp:dropdownlist id="FontType" runat=server>
                                         <asp:listitem>黑体</asp:listitem>
                                         <asp:listitem>仿宋</asp:listitem>
                                         <asp:listitem>隶书</asp:listitem>
                                         <asp:listitem>楷书</asp:listitem>
                                         <asp:listitem>方正姚体</asp:listitem>
                                         <asp:listitem>华文彩云</asp:listitem>
                                      </asp:dropdownlist>

                 <asp:button Text="Update Image" OnClick="UpdateBtn_Click" runat=server/>             </h3>
          </asp:panel>      </form>   </body>
</html>
http://www.cnblogs.com/index/archive/2004/10/20/54498.aspx
www.wave12.com缩略图水印组件wsImage3.5
http://blog.csdn.net/greennetboy/archive/2005/12/17/554465.aspx

谁知道怎么给上传的图片 加水印？

解决方案 »

谁知道怎么给上传的图片加水印？