按比例調整圖片尺寸

 1 #region 按比例調整圖片尺寸
 2 public static Bitmap GetThumbnail(Image bmp, int width, int height)
 3 {
 4     if (width == 0)
 5     {
 6         width = height * bmp.Width / bmp.Height;
 7     }
 8     if (height == 0)
 9     {
10         height = width * bmp.Height / bmp.Width;
11     }
12     Image imgSource = bmp;
 
13     Bitmap outBmp = new Bitmap(width, height);
14     Graphics g = Graphics.FromImage(outBmp);
15     g.Clear(Color.Transparent);
16     // 設定畫布的描繪質量   
17     g.CompositingQuality = CompositingQuality.HighQuality;
18     g.SmoothingMode = SmoothingMode.HighQuality;
19     g.InterpolationMode = InterpolationMode.HighQualityBicubic;
 
20 
21     g.DrawImage(imgSource, new Rectangle(0, 0, width, height + 1), 0, 0, imgSource.Width, imgSource.Height, GraphicsUnit.Pixel);
22 
23     g.Dispose();
24     imgSource.Dispose();
25     bmp.Dispose();
26     return outBmp;
27 }
28 #endregion

合成圖片

 1 /// <summary>
 2 /// 兩種圖片合併，類似相簿，有個背景圖，中間貼自己的目標圖片        
 
 3 /// <param name="sourceImg">貼上的源圖片</param>
 4 /// <param name="destImg">貼上的目標圖片</param>
 5 /// <param name="name">合成圖片儲存路徑</param>
 6 /// </summary>
 7 public void CombinImage(string sourceImg, string destImg, string name)
 8 {
 9     System.Drawing.Image imgBack = System.Drawing.Image.FromFile(sourceImg);     //相框圖片 
10     System.Drawing.Image img = System.Drawing.Image.FromFile(destImg);        //照片圖片
11 
12     Bitmap bmp = new Bitmap(imgBack.Width, imgBack.Height);
13 
14     Graphics g = Graphics.FromImage(bmp);
15     g.Clear(Color.White);
16     g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);
17     //g.FillRectangle(System.Drawing.Brushes.Black, 16, 16, (int)112 + 2, ((int)73 + 2));//相片四周刷一層黑色邊框
18 
19     //g.DrawImage(img, 照片與相框的左邊距, 照片與相框的上邊距, 照片寬, 照片高);
20     g.DrawImage(img, imgBack.Width / 2 - img.Width / 2 + 0, imgBack.Height / 2 - img.Height / 2 + 0, img.Width, img.Height);
21     GC.Collect();
22 
23     //儲存指定格式圖片
24     bmp.Save(name, ImageFormat.Png);    
25 }