在C＃/。NET中合併兩個圖像

Question

簡單的想法：我有兩個圖像要合併，一個是500x500，中間透明，另一個是150x150。

基本想法是這樣的：創建一個500x500的空畫布，將150x150圖片放置在空畫布中間，然後將500x500圖片複製到透明中間，以使150x150能夠透過。

我知道如何在Java，PHP和Python中完成它......我只是不知道在C＃中使用什麼對象/類，一個將圖像複製到另一個的快速示例就足夠了。

Answer 1

基本上我用這個在我們的應用程序之一：我們要覆蓋一個playicon在視頻的幀 ：

Image playbutton; 
try 
{ 
    playbutton = Image.FromFile(/*somekindofpath*/); 
} 
catch (Exception ex) 
{ 
    return; 
} 

Image frame; 
try 
{ 
    frame = Image.FromFile(/*somekindofpath*/); 
} 
catch (Exception ex) 
{ 
    return; 
} 

using (frame) 
{ 
    using (var bitmap = new Bitmap(width, height)) 
    { 
     using (var canvas = Graphics.FromImage(bitmap)) 
     { 
      canvas.InterpolationMode = InterpolationMode.HighQualityBicubic; 
      canvas.DrawImage(frame, 
          new Rectangle(0, 
              0, 
              width, 
              height), 
          new Rectangle(0, 
              0, 
              frame.Width, 
              frame.Height), 
          GraphicsUnit.Pixel); 
      canvas.DrawImage(playbutton, 
          (bitmap.Width/2) - (playbutton.Width/2), 
          (bitmap.Height/2) - (playbutton.Height/2)); 
      canvas.Save(); 
     } 
     try 
     { 
      bitmap.Save(/*somekindofpath*/, 
         System.Drawing.Imaging.ImageFormat.Jpeg); 
     } 
     catch (Exception ex) { } 
    } 
} 

Answer 2

這會將圖像添加到另一個圖像。

using (Graphics grfx = Graphics.FromImage(image)) 
{ 
    grfx.DrawImage(newImage, x, y) 
} 

圖形是在命名空間System.Drawing

Answer 3

畢竟這個，我發現了一個新的更簡單的方法試試這個..

它可以連接多張照片在一起：

public static System.Drawing.Bitmap CombineBitmap(string[] files) 
{ 
    //read all images into memory 
    List<System.Drawing.Bitmap> images = new List<System.Drawing.Bitmap>(); 
    System.Drawing.Bitmap finalImage = null; 

    try 
    { 
     int width = 0; 
     int height = 0; 

     foreach (string image in files) 
     { 
      //create a Bitmap from the file and add it to the list 
      System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(image); 

      //update the size of the final bitmap 
      width += bitmap.Width; 
      height = bitmap.Height > height ? bitmap.Height : height; 

      images.Add(bitmap); 
     } 

     //create a bitmap to hold the combined image 
     finalImage = new System.Drawing.Bitmap(width, height); 

     //get a graphics object from the image so we can draw on it 
     using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(finalImage)) 
     { 
      //set background color 
      g.Clear(System.Drawing.Color.Black); 

      //go through each image and draw it on the final image 
      int offset = 0; 
      foreach (System.Drawing.Bitmap image in images) 
      { 
       g.DrawImage(image, 
        new System.Drawing.Rectangle(offset, 0, image.Width, image.Height)); 
       offset += image.Width; 
      } 
     } 

     return finalImage; 
    } 
    catch (Exception ex) 
    { 
     if (finalImage != null) 
      finalImage.Dispose(); 

     throw ex; 
    } 
    finally 
    { 
     //clean up memory 
     foreach (System.Drawing.Bitmap image in images) 
     { 
      image.Dispose(); 
     } 
    } 
}