图片缩放函数

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 1 ///<summary>
 2 /// 图片缩放函数
 3 ///</summary>
 4         private static Bitmap Zoom(string imagePath, string imageName, int requiredWidth, int requiredHeight)
 5         {
 6             try
 7             {
 8                 using (System.Drawing.Image OriginalImage = System.Drawing.Image.FromFile(Path.Combine(imagePath, imageName)))
 9                 {
10                     int max = Math.Max(OriginalImage.Width, OriginalImage.Height);
11                     double prec = (double)requiredWidth / max;
12                     int width = (int)(OriginalImage.Width * prec);
13                     int height = (int)(OriginalImage.Height * prec);
14 
15                     System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(width, height);
16                     bmp.SetResolution(OriginalImage.HorizontalResolution, OriginalImage.VerticalResolution);
17                     System.Drawing.Graphics Graphic = System.Drawing.Graphics.FromImage(bmp);
18 
19                     Graphic.SmoothingMode = SmoothingMode.AntiAlias;
20                     Graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
21                     Graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
22                     Graphic.DrawImage(OriginalImage, new System.Drawing.Rectangle(0, 0, width, height));
23                     Graphic.Dispose();
24 
25                     OriginalImage.Dispose();
26                    
27                     return bmp;
28                 }
29             }
30             catch (Exception Ex)
31             {
32                 throw (Ex);
33             }
34         }