c# bitmap的拷贝及一个图像工具类

1                 using (Bitmap bmp = new Bitmap(scanImgPath))
2                 {
3                     Bitmap bitmap = new Bitmap(bmp.Width, bmp.Height, PixelFormat.Format16bppRgb555);
4                     using (Graphics draw = Graphics.FromImage(bitmap))
5                     {
6                         draw.DrawImage(bmp, 0, 0, bitmap.Width, bitmap.Height);
7                         picScanImg.Image = bitmap as Image;
8                     }
9                 }

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Drawing;
  4 using System.Text;
  5 
  6 namespace TJCFinanceWriteOff.BizLogic.Common
  7 {
  8     public class ImageUtil
  9     {
 10         /// <summary>
 11         /// 图片镜像翻转
 12         /// </summary>
 13         /// <param name="imagePath">图片路径</param>
 14         /// <param name="isCover">是否覆盖</param>
 15         /// <returns></returns>
 16         public static Image ImageFlip(string imagePath,bool isCover = false)
 17         {
 18             Bitmap bitmap = Bitmap.FromFile(imagePath) as Bitmap;
 19             bitmap.RotateFlip(RotateFlipType.Rotate180FlipY);  //图片镜像翻转
 20             if (isCover is true) bitmap.Save(imagePath,System.Drawing.Imaging.ImageFormat.Jpeg);
 21             return bitmap;
 22         }
 23 
 24         /// <summary>
 25         /// 图片顺时针旋转180度
 26         /// </summary>
 27         /// <param name="imagePath">图片路径</param>
 28         /// <param name="isCover">是否覆盖</param>
 29         /// <returns></returns>
 30         public static Image ImageRotate(string imagePath,bool isCover = false)
 31         {
 32             Bitmap bitmap = Bitmap.FromFile(imagePath) as Bitmap;
 33             bitmap.RotateFlip(RotateFlipType.Rotate180FlipNone);  //图片顺时针180度
 34             if (isCover is true) bitmap.Save(imagePath,System.Drawing.Imaging.ImageFormat.Jpeg);
 35             return bitmap;
 36         }
 37 
 38         /// <summary>
 39         /// 图片等比缩放
 40         /// </summary>
 41         /// <param name="imagePath"></param>
 42         /// <returns></returns>
 43         public static Image ImageScaleZoom(string imagePath, double process)
 44         {
 45             Bitmap bitmap = Bitmap.FromFile(imagePath) as Bitmap;
 46             double width = bitmap.Width * process; ;//图片最终的宽
 47             double height = bitmap.Height * process;//图片最终的高
 48             return bitmap.GetThumbnailImage((int)width, (int)height, () => { return false; }, IntPtr.Zero);
 49         }
 50 
 51         public static Image ImageScaleZoom(Image sourceImage, double process)
 52         {
 53             double width = sourceImage.Width * process; ;//图片最终的宽
 54             double height = sourceImage.Height * process;//图片最终的高
 55             try
 56             {
 57                 System.Drawing.Imaging.ImageFormat format = sourceImage.RawFormat;
 58                 Bitmap targetPicture = new Bitmap((int)width, (int)height);
 59                 Graphics g = Graphics.FromImage(targetPicture);
 60                 g.DrawImage(sourceImage, 0, 0, (int)width, (int)height);
 61                 sourceImage.Dispose();
 62                 return targetPicture;
 63             }
 64             catch (Exception ex)
 65             {
 66 
 67             }
 68             return null;
 69         }
 70 
 71         public static Image ImageAssignZoom(Image sourceImage, int targetWidth, int targetHeight)
 72         {
 73             int width;//图片最终的宽
 74             int height;//图片最终的高
 75             try
 76             {
 77                 System.Drawing.Imaging.ImageFormat format = sourceImage.RawFormat;
 78                 Bitmap targetPicture = new Bitmap(targetWidth, targetHeight);
 79                 Graphics g = Graphics.FromImage(targetPicture);
 80 
 81                 if (sourceImage.Width > targetWidth && sourceImage.Height <= targetHeight)
 82                 {
 83                     width = targetWidth;
 84                     height = (width * sourceImage.Height) / sourceImage.Width;  //噶
 85                 }
 86                 else if (sourceImage.Width <= targetWidth && sourceImage.Height > targetHeight)
 87                 {
 88                     height = targetHeight;
 89                     width = (height * sourceImage.Width) / sourceImage.Height;
 90                 }
 91                 else if (sourceImage.Width <= targetWidth && sourceImage.Height <= targetHeight)
 92                 {
 93                     width = sourceImage.Width;
 94                     height = sourceImage.Height;
 95                 }
 96                 else
 97                 {
 98                     width = targetWidth;
 99                     height = (width * sourceImage.Height) / sourceImage.Width;
100                     if (height > targetHeight)
101                     {
102                         height = targetHeight;
103                         width = (height * sourceImage.Width) / sourceImage.Height;
104                     }
105                 }
106                 g.DrawImage(sourceImage, 0, 0, width, height);
107                 sourceImage.Dispose();
108 
109                 return targetPicture;
110             }
111             catch (Exception ex)
112             {
113 
114             }
115             return null;
116         }
117     }
118 }