C # using the overlap of original artwork and watermark to realize watermark simply _c# tutorial

The example of this article is about C # using the original image and watermark map to realize the simple watermark method. Share to everyone for your reference, specific as follows:

Picture Action Class

<summary>///Gets the size of a picture scaled down by equal proportions. </summary>///<param name= "maxwidth" > need to be narrowed to the width </param>///<param name= "MaxHeight" > The height needed to be narrowed </param>///<param name= "Imageoriginalwidth" > The original width of the picture </param>///<param name= " Imageoriginalheight "> Original height </param>///<returns> returns the actual size of the picture by equal proportions </returns> public static
  Size getnewsize (int maxwidth, int maxheight, int imageoriginalwidth, int imageoriginalheight) {Double w = 0.0;
  Double h = 0.0;
  Double SW = convert.todouble (imageoriginalwidth);
  Double sh = convert.todouble (imageoriginalheight);
  Double MW = convert.todouble (maxwidth);
  Double MH = convert.todouble (maxheight);
    if (SW < MW && SH < MH) {w = SW;
  h = sh;
    else if ((sw/sh) > (MW/MH)) {w = maxwidth;
  H = (W * sh)/SW;
    else {h = maxheight;
  W = (H * sw)/sh;
return new Size (Convert.ToInt32 (w), Convert.ToInt32 (h)); }///<summary>///for a givenA picture (Image object) generates a thumbnail of the specified size. </summary>///<param name= "Originalimage" > Original picture </param>///<param name= "Thummaxwidth" > Thumbnail width </param>///<param name= "thummaxheight" > Thumbnail height </param>///<returns> Returns the image object of the thumbnail </returns> public static System.Drawing.Image getthumbnailimage (System.Drawing.Image originalimage, int
  thummaxwidth, int thummaxheight) {Size thumrealsize = Size.empty;
  System.Drawing.Image newimage = originalimage;
  Graphics Graphics = null;
    try {thumrealsize = getnewsize (Thummaxwidth, Thummaxheight, Originalimage.width, originalimage.height);
    NewImage = new Bitmap (thumrealsize.width, thumrealsize.height);
    Graphics = Graphics.fromimage (newimage);
    graphics.compositingquality = compositingquality.highquality; Graphics.
    Interpolationmode = Interpolationmode.highqualitybicubic; Graphics.
    SmoothingMode = smoothingmode.highquality; Graphics.
    Clear (color.transparent); Graphics. DrawImage (OriginaliMage, New Rectangle (0, 0, Thumrealsize.width, thumrealsize.height), new Rectangle (0, 0, Originalimage.width,
  originalimage.height), GraphicsUnit.Pixel); The catch {} finally {if (graphics!= null) {graphics.
      Dispose ();
    graphics = null;
} return newimage;
///<summary>///generates a thumbnail of the specified size for a given picture file. </summary>///<param name= "originalimage" > Physical file Address of the picture </param>///<param name= "Thummaxwidth" > Thumbnail width </param>///<param name= "thummaxheight" > Thumbnail height </param>///<returns> Returns the image object </returns> public static System.Drawing.Image getthumbnailimage of the thumbnail (string imagefile, int thummaxwidth
  , int thummaxheight) {System.Drawing.Image originalimage = null;
  System.Drawing.Image newimage = null;
    try {originalimage = System.Drawing.Image.FromFile (ImageFile);
  NewImage = Getthumbnailimage (Originalimage, Thummaxwidth, thummaxheight);
  The catch {} finally {if (originalimage!= null)  {Originalimage.dispose ();
    Originalimage = null;
} return newimage;
///<summary>///generates a thumbnail of the specified size for a given picture file and saves the thumbnail to the specified location. </summary>///<param name= "Originalimagefile" > Physical file Address of the picture </param>///<param name= " Thumbnailimagefile "> Thumbnail physical file address </param>///<param name=" thummaxwidth "> Thumbnail width </param>///< param name= "thummaxheight" > Thumbnail height </param> public static void Makethumbnail (String originalimagefile, String thumbnailimagefile, int thummaxwidth, int thummaxheight) {System.Drawing.Image newimage = getthumbnailimage (Originalim
  Agefile, Thummaxwidth, thummaxheight);
  try {newimage.save (thumbnailimagefile, imageformat.jpeg);
    Catch {} finally {newimage.dispose ();
  NewImage = null;
}///<summary>///adjusts the memory flow of a picture to the specified size and returns the adjusted memory stream. </summary>///<param name= "Originalimagestream" > The memory stream of the original picture </param>///<param name= "Newwidth" > Width of new picture </param>///<param name= "Newheight" > New picture height </param>///<returns> return adjusted picture's memory stream </returns> public static
  MemoryStream resizeimage (Stream originalimagestream, int newwidth, int newheight) {MemoryStream = null; System.Drawing.Image newimage = Globals.getthumbnailimage (System.Drawing.Image.FromStream (Originalimagestream),
  Newwidth, Newheight);
    if (newimage!= null) {Newimagestream = new MemoryStream ();
  Newimage.save (Newimagestream, imageformat.jpeg);
return newimagestream;
///<summary>///saves a memory stream as a disk file. </summary>///<param name= "stream" > Memory stream </param>///<param name= "newFile" > Destination disk File Address </ param> public static void Savestreamtofile (Stream stream, string newFile) {if (stream = null | |) stream. Length = = 0 | | String.
  IsNullOrEmpty (NewFile)) {return; } byte[] buffer = new Byte[stream.
  Length]; Stream.
  Position = 0; Stream. Read (buffer, 0, buffer.)
  Length); FileStream FileStream = new FilestrEAM (NewFile, FileMode.OpenOrCreate, FileAccess.Write); FileStream.Write (buffer, 0, buffer.
  Length);
  Filestream.flush ();
  Filestream.close ();
Filestream.dispose ();
///<summary>///Adds a picture watermark effect to a specified picture. </summary>///<param name= "imagefile" > Picture file Address </param>///<param name= "Waterimage" > Watermark Picture (Image object) </param> public static void Createimagewatermark (String imagefile, System.Drawing.Image waterimage ) {if (string. IsNullOrEmpty (imagefile) | | ! File.exists (imagefile) | |
  Waterimage = = null) {return;
  } System.Drawing.Image originalimage = System.Drawing.Image.FromFile (ImageFile);
  if (originalimage.width-10 < Waterimage.width | | | originalimage.height-10 < waterimage.height) {return;
  } Graphics Graphics = Graphics.fromimage (originalimage);
  int x = originalimage.width-waterimage.width-10;
  int y = originalimage.height-waterimage.height-10;
  int width = waterimage.width;
  int height = waterimage.height; GraPhics.
  DrawImage (Waterimage, New Rectangle (x, y, width, height), 0, 0, width, height, graphicsunit.pixel); Graphics.
  Dispose ();
  MemoryStream stream = new MemoryStream ();
  Originalimage.save (stream, imageformat.jpeg);
  Originalimage.dispose ();
  System.Drawing.Image imagewithwater = System.Drawing.Image.FromStream (stream);
  Imagewithwater.save (ImageFile);
Imagewithwater.dispose ();
///<summary>///A text watermark effect on a specified picture. </summary>///<param name= "imagefile" > Picture file Address </param>///<param name= "Watertext" > Watermark text content </param> public static void Createtextwatermark (String imagefile, String watertext) {if (string). IsNullOrEmpty (imagefile) | | String. IsNullOrEmpty (watertext) | | !
  File.exists (ImageFile)) {return;
  } System.Drawing.Image originalimage = System.Drawing.Image.FromFile (ImageFile);
  Graphics Graphics = Graphics.fromimage (originalimage); Graphics.
  SmoothingMode = smoothingmode.highquality; Graphics. TextRenderingHint = TextrenderinghInt.
  Cleartypegridfit;
  graphics.compositingquality = compositingquality.highquality; Graphics.
  Interpolationmode = Interpolationmode.highqualitybicubic;
  SolidBrush brush = new SolidBrush (Color.FromArgb (153, 255, 255, 255));
  Font watertextfont = new Font ("Arial", fontstyle.regular); SizeF watertextsize = Graphics.
  MeasureString (Watertext, Watertextfont);
  float x = (float) originalimage.width-watertextsize.width-10f;
  Float y = (float) originalimage.height-watertextsize.height-10f; Graphics.
  DrawString (Watertext, Watertextfont, brush, x, y); Graphics.
  Dispose (); Brush.
  Dispose ();
  MemoryStream stream = new MemoryStream ();
  Originalimage.save (stream, imageformat.jpeg);
  Originalimage.dispose ();
  System.Drawing.Image imagewithwater = System.Drawing.Image.FromStream (stream);
  Imagewithwater.save (ImageFile);
Imagewithwater.dispose ();
///<summary>///Determine if the upload component contains content. </summary>///<param name= "FileUpload" >asp.net 2.0 standard Upload components </param>///<returns> Returns True if the data is valid, otherwise returns false</returns> public static bool Isattachmentvalid (FileUpload fileupload {if (fileupload!= null && fileupload.postedfile!= null &&!string.) IsNullOrEmpty (fileUpload.PostedFile.FileName) && fileUpload.PostedFile.ContentLength > 0) {return TR
  Ue
return false;

 }

public class Imagehelper {#region "watermark stored relative path" public static string Getlogopath () {return "/images/logo.png"  ; Watermark Map Path} #endregion #region "picture watermark"//<summary>//Image watermark on the picture, this method does not support GIF-type pictures//</summary>/ /<param name= "path" > Original server Picture path </param>//<param name= "PATH_SYP" > generated photo watermark with picture path </param>//< param name= "PATH_SYPF" > Watermark picture path </param> public static void Markimage (Stream inuploadimagepath, string Inlogoimagepath, String insavepath) {System.Drawing.Image Image = System.Drawing.Image.FromStream (inuploadimagepath
    );
    System.Drawing.Image newimage = Image.FromFile (Current.Server.MapPath (Inlogoimagepath));
    Graphics g = graphics.fromimage (Image); G.drawimage (NewImage, New Rectangle (Image.width-newimage). Width, Image.height-newimage. Height, NewImage. Width, NewImage. Height), 0, 0, NewImage. Width, NewImage.
    Height, GraphicsUnit.Pixel); try {image.save (Current.Server.MapPath (Insavepath));
    The catch (Exception ex) {} finally {g.dispose ();
      Image.dispose (); NewImage.
    Dispose ();

 }} #endregion}

Read more about C # Interested readers can view the site topics: "C # Picture Operation Tips Summary", "WinForm Control Usage Summary", "C # Data structure and algorithm tutorial", "C # Common control usage Tutorial", "C # object-oriented Program design Introductory Course" and "C # A summary of thread usage tips for programming

I hope this article will help you with C # programming.