ASP.NET2.0打通文件图片处理任督二脉

  imgPhoto = bmPhoto;
  grPhoto.Dispose();

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

  //Text alignment
 }

 private void WriteImg()
 {
  //set a working directory
  //string WorkingDirectory = @"C:\Watermark_src\WaterPic";

  //create a image object containing the photograph to watermark
  Image imgPhoto = Image.FromFile(WorkingDirectory + ImageName);
  int phWidth = imgPhoto.Width;
  int phHeight = imgPhoto.Height;

  //create a Bitmap the Size of the original photograph
  Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);

  bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

  //load the Bitmap into a Graphics object
  Graphics grPhoto = Graphics.FromImage(bmPhoto);

  //create a image object containing the watermark
  Image imgWatermark = new Bitmap(WorkingDirectory + ImageWater);
  int wmWidth = imgWatermark.Width;
  int wmHeight = imgWatermark.Height;

  //Set the rendering quality for this Graphics object
  grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

  //Draws the photo Image object at original size to the graphics object.
  grPhoto.DrawImage(
   imgPhoto,                               // Photo Image object
   new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
   0,                                      // x-coordinate of the portion of the source image to draw.
   0,                                      // y-coordinate of the portion of the source image to draw.
   phWidth,                                // Width of the portion of the source image to draw.
   phHeight,                               // Height of the portion of the source image to draw.
   GraphicsUnit.Pixel);                    // Units of measure

  //------------------------------------------------------------
  //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();

 }

 private void WriteFontAndImg()
 {

  //create a image object containing the photograph to watermark
  Image imgPhoto = Image.FromFile(WorkingDirectory + ImageName);
  int phWidth = imgPhoto.Width;
  int phHeight = imgPhoto.Height;

  //create a Bitmap the Size of the original photograph
  Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);

  bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

  //load the Bitmap into a Graphics object
  Graphics grPhoto = Graphics.FromImage(bmPhoto);

  //create a image object containing the watermark
  Image imgWatermark = new Bitmap(WorkingDirectory + ImageWater);
  int wmWidth = imgWatermark.Width;
  int wmHeight = imgWatermark.Height;

  //------------------------------------------------------------
  //Step #1 - Insert Copyright message
  //------------------------------------------------------------

  //Set the rendering quality for this Graphics object
  grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

  //Draws the photo Image object at original size to the graphics object.
  grPhoto.DrawImage(
   imgPhoto,                               // Photo Image object
   new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
   0,                                      // x-coordinate of the portion of the source image to draw.
   0,                                      // y-coordinate of the portion of the source image to draw.
   phWidth,                                // Width of the portion of the source image to draw.
   phHeight,                               // Height of the portion of the source image to draw.
   GraphicsUnit.Pixel);                    // Units of measure

  //-------------------------------------------------------
  //to maximize the size of the Copyright message we will
  //test multiple Font sizes to determine the largest posible
  //font we can use for the width of the Photograph
  //define an array of point sizes you would like to consider as possiblities
  //-------------------------------------------------------
  int[] sizes = new int[]{16,14,12,10,8,6,4};

  Font crFont = null;
  SizeF crSize = new SizeF();

  //Loop through the defined sizes checking the length of the Copyright string
  //If its length in pixles is less then the image width choose this Font size.
  for (int i=0 ;i<7; i++)
  {
   //set a Font object to Arial (i)pt, Bold
   crFont = new Font("arial", sizes[i], FontStyle.Bold);
   //Measure the Copyright string in this Font
   crSize = grPhoto.MeasureString(FontString, crFont);

   if((ushort)crSize.Width < (ushort)phWidth)
    break;
  }

  //Since all photographs will have varying heights, determine a
  //position 5% from the bottom of the image
  int yPixlesFromBottom = (int)(phHeight *.05);

  //Now that we have a point size use the Copyrights string height
  //to determine a y-coordinate to draw the string of the photograph
  float yPosFromBottom = ((phHeight - yPixlesFromBottom)-(crSize.Height/2));

  //Determine its x-coordinate by calculating the center of the width of the image
  float xCenterOfImg = (phWidth/2);

  //Define the text layout by setting the text alignment to centered
  StringFormat StrFormat = new StringFormat();
  StrFormat.Alignment = StringAlignment.Center;

  //define a Brush which is semi trasparent black (Alpha set to 153)
  SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));

  //Draw the Copyright string
  grPhoto.DrawString(FontString,                 //string of text
   crFont,                                   //font
   semiTransBrush2,                           //Brush
   new PointF(xCenterOfImg+1,yPosFromBottom+1),  //Position
   StrFormat);

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