ASP.NET2.0打通文件图片处理任督二脉

  //define a Brush which is semi trasparent white (Alpha set to 153)
  SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));

  //Draw the Copyright string a second time to create a shadow effect
  //Make sure to move this text 1 pixel to the right and down 1 pixel
  grPhoto.DrawString(FontString,                 //string of text
   crFont,                                   //font
   semiTransBrush,                           //Brush
   new PointF(xCenterOfImg,yPosFromBottom),  //Position
   StrFormat);                               //Text alignment

  //------------------------------------------------------------
  //Step #2 - Insert Watermark image
  //------------------------------------------------------------

  //Create a Bitmap based on the previously modified photograph Bitmap
  Bitmap bmWatermark = new Bitmap(bmPhoto);
  bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
  //Load this Bitmap into a new Graphic Object
  Graphics grWatermark = Graphics.FromImage(bmWatermark);

  //To achieve a transulcent watermark we will apply (2) color
  //manipulations by defineing a ImageAttributes object and
  //seting (2) of its properties.
  ImageAttributes imageAttributes = new ImageAttributes();

  //The first step in manipulating the watermark image is to replace
  //the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0)
  //to do this we will use a Colormap and use this to define a RemapTable
  ColorMap colorMap = new ColorMap();

  //My watermark was defined with a background of 100% Green this will
  //be the color we search for and replace with transparency
  colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
  colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);

  ColorMap[] remapTable = {colorMap};

  imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

  //The second color manipulation is used to change the opacity of the
  //watermark.  This is done by applying a 5x5 matrix that contains the
  //coordinates for the RGBA space.  By setting the 3rd row and 3rd column
  //to 0.3f we achive a level of opacity
  float[][] colorMatrixElements = {
           new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},
           new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},
           new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},
           new float[] {0.0f,  0.0f,  0.0f,  0.3f, 0.0f},
           new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}};
  ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);

  imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
   ColorAdjustType.Bitmap);

  //For this example we will place the watermark in the upper right
  //hand corner of the photograph. offset down 10 pixels and to the
  //left 10 pixles

  int xPosOfWm = ((phWidth - wmWidth)-10);
  int yPosOfWm = 10;

  grWatermark.DrawImage(imgWatermark,
   new Rectangle(xPosOfWm,yPosOfWm,wmWidth,wmHeight),  //Set the detination Position
   0,                  // x-coordinate of the portion of the source image to draw.
   0,                  // y-coordinate of the portion of the source image to draw.
   wmWidth,            // Watermark Width
   wmHeight,      // Watermark Height
   GraphicsUnit.Pixel, // Unit of measurment
   imageAttributes);   //ImageAttributes Object

  //Replace the original photgraphs bitmap with the new Bitmap
  imgPhoto = bmWatermark;
  grPhoto.Dispose();
  grWatermark.Dispose();

  //save new image to file system.
  imgPhoto.Save(WorkingDirectory + ImageName +"_finally.jpg", ImageFormat.Jpeg);
  imgPhoto.Dispose();
  imgWatermark.Dispose();

 }
}

 //水印图片加水印文字
//   ReDrawImg img = new ReDrawImg();
//   img .PublicWorkingDirectory = @"C:\Watermark_src\WaterPic\";
//   img .PublicImageName = "watermark_photo.jpg";
//   img .PublicImageWater = "watermark.bmp";
//   img .PublicFontString = "清清月儿";
//   img .DealImage();

   //水印文字
   ReDrawImg img = new ReDrawImg();
   img .PublicWorkingDirectory = @"C:\Watermark_src\WaterPic\";
   img .PublicImageName = "watermark_photo.jpg";
   img .PublicFontString = @"清清月儿";
   img .DealImage();

   //水印图片
//   ReDrawImg img = new ReDrawImg();
//   img .PublicWorkingDirectory = @"C:\Watermark_src\WaterPic\";
//   img .PublicImageName = "watermark_photo.jpg";
//   img .PublicImageWater = "watermark.bmp";
//   img .DealImage();

后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void bt_upload_Click(object sender, EventArgs e)
    {
        try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                this.lb_info.Text = "请选择文件！";
            }
            else
            {
                string filepath = FileUpload1.PostedFile.FileName;
                string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);
                string serverpath1 = Server.MapPath("images/") + filename;
                //string serverpath2 = Server.MapPath("images/") + System.DateTime.Now.ToString("yyy-MM-dd-hh-mm-ss") + Session.SessionID + filename;
                FileUpload1.PostedFile.SaveAs(serverpath1);
                //ImageThumbnail img = new ImageThumbnail(filepath);
                //img.ReducedImage(0.4, serverpath2);
                DrawImg img = new DrawImg();
                img.PublicWorkingDirectory = Server.MapPath("images/");
                img.PublicImageName = filename;
                img.PublicFontString = "http://blog.csdn.net/21aspnet";
                img.PublicImageWater = "yyy.jpg";
                img.DealImage();
                this.lb_info.Text = "上传成功！";
            }
        }
        catch (Exception error)
        {
            this.lb_info.Text = "上传发生错误！原因：" + error.ToString();
        }
    }

}

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