最全的C#图片处理帮助类ImageHelper

最全的C#图片处理帮助类ImageHelper.cs

方法介绍：

• 生成缩略图
• 图片水印处理方法
• 图片水印位置处理方法
• 文字水印处理方法
• 文字水印位置的方法
• 调整光暗
• 反色处理
• 浮雕处理
• 拉伸图片
• 滤色处理
• 左右翻转
• 上下翻转
• 压缩到指定尺寸
• 转换为黑白图片
• 获取图片中的各帧

资源下载列表

 using System;
 using System.Collections;
 using System.IO;
 using System.Drawing;
 using System.Drawing.Imaging;
 using System.Drawing.Drawing2D;

 namespace HelloCsharp.Utilities
 {
     public class ImageClass
     {
         public ImageClass()
         { }

         #region 缩略图
         /// <summary>
         /// 生成缩略图
         /// </summary>
         /// <param name="originalImagePath">源图路径（物理路径）</param>
         /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
         /// <param name="width">缩略图宽度</param>
         /// <param name="height">缩略图高度</param>
         /// <param name="mode">生成缩略图的方式</param>   
         public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
         {
             System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);

             int towidth = width;
             int toheight = height;

             int x = ;
             int y = ;
             int ow = originalImage.Width;
             int oh = originalImage.Height;

             switch (mode)
             {
                 case "HW":  //指定高宽缩放（可能变形）               
                     break;
                 case "W":   //指定宽，高按比例                   
                     toheight = originalImage.Height * width / originalImage.Width;
                     break;
                 case "H":   //指定高，宽按比例
                     towidth = originalImage.Width * height / originalImage.Height;
                     break;
                 case "Cut": //指定高宽裁减（不变形）               
                     if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                     {
                         oh = originalImage.Height;
                         ow = originalImage.Height * towidth / toheight;
                         y = ;
                         x = (originalImage.Width - ow) / ;
                     }
                     else
                     {
                         ow = originalImage.Width;
                         oh = originalImage.Width * height / towidth;
                         x = ;
                         y = (originalImage.Height - oh) / ;
                     }
                     break;
                 default:
                     break;
             }

             //新建一个bmp图片
             System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

             //新建一个画板
             System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

             //设置高质量插值法
             g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

             //设置高质量,低速度呈现平滑程度
             g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

             //清空画布并以透明背景色填充
             g.Clear(System.Drawing.Color.Transparent);

             //在指定位置并且按指定大小绘制原图片的指定部分
             g.DrawImage(originalImage, new System.Drawing.Rectangle(, , towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);

             try
             {
                 //以jpg格式保存缩略图
                 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
             }
             catch (System.Exception e)
             {
                 throw e;
             }
             finally
             {
                 originalImage.Dispose();
                 bitmap.Dispose();
                 g.Dispose();
             }
         }
         #endregion

         #region 图片水印
         /// <summary>
         /// 图片水印处理方法
         /// </summary>
         /// <param name="path">需要加载水印的图片路径（绝对路径）</param>
         /// <param name="waterpath">水印图片（绝对路径）</param>
         /// <param name="location">水印位置（传送正确的代码）</param>
         public static string ImageWatermark(string path, string waterpath, string location)
         {
             string kz_name = Path.GetExtension(path);
             if (kz_name == ".jpg" || kz_name == ".bmp" || kz_name == ".jpeg")
             {
                 DateTime time = DateTime.Now;
                 string filename = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() + time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() + time.Millisecond.ToString();
                 Image img = Bitmap.FromFile(path);
                 Image waterimg = Image.FromFile(waterpath);
                 Graphics g = Graphics.FromImage(img);
                 ArrayList loca = GetLocation(location, img, waterimg);
                 g.DrawImage(waterimg, new Rectangle(int.Parse(loca[].ToString()), int.Parse(loca[].ToString()), waterimg.Width, waterimg.Height));
                 waterimg.Dispose();
                 g.Dispose();
                 string newpath = Path.GetDirectoryName(path) + filename + kz_name;
                 img.Save(newpath);
                 img.Dispose();
                 File.Copy(newpath, path, true);
                 if (File.Exists(newpath))
                 {
                     File.Delete(newpath);
                 }
             }
             return path;
         }

         /// <summary>
         /// 图片水印位置处理方法
         /// </summary>
         /// <param name="location">水印位置</param>
         /// <param name="img">需要添加水印的图片</param>
         /// <param name="waterimg">水印图片</param>
         private static ArrayList GetLocation(string location, Image img, Image waterimg)
         {
             ArrayList loca = new ArrayList();
             int x = ;
             int y = ;

             if (location == "LT")
             {
                 x = ;
                 y = ;
             }
             else if (location == "T")
             {
                 x = img.Width /  - waterimg.Width / ;
                 y = img.Height - waterimg.Height;
             }
             else if (location == "RT")
             {
                 x = img.Width - waterimg.Width;
                 y = ;
             }
             else if (location == "LC")
             {
                 x = ;
                 y = img.Height /  - waterimg.Height / ;
             }
             else if (location == "C")
             {
                 x = img.Width /  - waterimg.Width / ;
                 y = img.Height /  - waterimg.Height / ;
             }
             else if (location == "RC")
             {
                 x = img.Width - waterimg.Width;
                 y = img.Height /  - waterimg.Height / ;
             }
             else if (location == "LB")
             {
                 x = ;
                 y = img.Height - waterimg.Height;
             }
             else if (location == "B")
             {
                 x = img.Width /  - waterimg.Width / ;
                 y = img.Height - waterimg.Height;
             }
             else
             {
                 x = img.Width - waterimg.Width;
                 y = img.Height - waterimg.Height;
             }
             loca.Add(x);
             loca.Add(y);
             return loca;
         }
         #endregion

         #region 文字水印
         /// <summary>
         /// 文字水印处理方法
         /// </summary>
         /// <param name="path">图片路径（绝对路径）</param>
         /// <param name="size">字体大小</param>
         /// <param name="letter">水印文字</param>
         /// <param name="color">颜色</param>
         /// <param name="location">水印位置</param>
         public static string LetterWatermark(string path, int size, string letter, Color color, string location)
         {
             #region

             string kz_name = Path.GetExtension(path);
             if (kz_name == ".jpg" || kz_name == ".bmp" || kz_name == ".jpeg")
             {
                 DateTime time = DateTime.Now;
                 string filename = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() + time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() + time.Millisecond.ToString();
                 Image img = Bitmap.FromFile(path);
                 Graphics gs = Graphics.FromImage(img);
                 ArrayList loca = GetLocation(location, img, size, letter.Length);
                 Font font = new Font("宋体", size);
                 Brush br = new SolidBrush(color);
                 gs.DrawString(letter, font, br, float.Parse(loca[].ToString()), float.Parse(loca[].ToString()));
                 gs.Dispose();
                 string newpath = Path.GetDirectoryName(path) + filename + kz_name;
                 img.Save(newpath);
                 img.Dispose();
                 File.Copy(newpath, path, true);
                 if (File.Exists(newpath))
                 {
                     File.Delete(newpath);
                 }
             }
             return path;

             #endregion
         }

         /// <summary>
         /// 文字水印位置的方法
         /// </summary>
         /// <param name="location">位置代码</param>
         /// <param name="img">图片对象</param>
         /// <param name="width">宽(当水印类型为文字时,传过来的就是字体的大小)</param>
         /// <param name="height">高(当水印类型为文字时,传过来的就是字符的长度)</param>
         private static ArrayList GetLocation(string location, Image img, int width, int height)
         {
             #region

             ArrayList loca = new ArrayList();  //定义数组存储位置
             float x = ;
             float y = ;

             if (location == "LT")
             {
                 loca.Add(x);
                 loca.Add(y);
             }
             else if (location == "T")
             {
                 x = img.Width /  - (width * height) / ;
                 loca.Add(x);
                 loca.Add(y);
             }
             else if (location == "RT")
             {
                 x = img.Width - width * height;
             }
             else if (location == "LC")
             {
                 y = img.Height / ;
             }
             else if (location == "C")
             {
                 x = img.Width /  - (width * height) / ;
                 y = img.Height / ;
             }
             else if (location == "RC")
             {
                 x = img.Width - height;
                 y = img.Height / ;
             }
             else if (location == "LB")
             {
                 y = img.Height - width - ;
             }
             else if (location == "B")
             {
                 x = img.Width /  - (width * height) / ;
                 y = img.Height - width - ;
             }
             else
             {
                 x = img.Width - width * height;
                 y = img.Height - width - ;
             }
             loca.Add(x);
             loca.Add(y);
             return loca;

             #endregion
         }
         #endregion

         #region 调整光暗
         /// <summary>
         /// 调整光暗
         /// </summary>
         /// <param name="mybm">原始图片</param>
         /// <param name="width">原始图片的长度</param>
         /// <param name="height">原始图片的高度</param>
         /// <param name="val">增加或减少的光暗值</param>
         public Bitmap LDPic(Bitmap mybm, int width, int height, int val)
         {
             Bitmap bm = new Bitmap(width, height);//初始化一个记录经过处理后的图片对象
             int x, y, resultR, resultG, resultB;//x、y是循环次数，后面三个是记录红绿蓝三个值的
             Color pixel;
             for (x = ; x < width; x++)
             {
                 for (y = ; y < height; y++)
                 {
                     pixel = mybm.GetPixel(x, y);//获取当前像素的值
                     resultR = pixel.R + val;//检查红色值会不会超出[0, 255]
                     resultG = pixel.G + val;//检查绿色值会不会超出[0, 255]
                     resultB = pixel.B + val;//检查蓝色值会不会超出[0, 255]
                     bm.SetPixel(x, y, Color.FromArgb(resultR, resultG, resultB));//绘图
                 }
             }
             return bm;
         }
         #endregion

         #region 反色处理
         /// <summary>
         /// 反色处理
         /// </summary>
         /// <param name="mybm">原始图片</param>
         /// <param name="width">原始图片的长度</param>
         /// <param name="height">原始图片的高度</param>
         public Bitmap RePic(Bitmap mybm, int width, int height)
         {
             Bitmap bm = new Bitmap(width, height);//初始化一个记录处理后的图片的对象
             int x, y, resultR, resultG, resultB;
             Color pixel;
             for (x = ; x < width; x++)
             {
                 for (y = ; y < height; y++)
                 {
                     pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
                     resultR =  - pixel.R;//反红
                     resultG =  - pixel.G;//反绿
                     resultB =  - pixel.B;//反蓝
                     bm.SetPixel(x, y, Color.FromArgb(resultR, resultG, resultB));//绘图
                 }
             }
             return bm;
         }
         #endregion

         #region 浮雕处理
         /// <summary>
         /// 浮雕处理
         /// </summary>
         /// <param name="oldBitmap">原始图片</param>
         /// <param name="Width">原始图片的长度</param>
         /// <param name="Height">原始图片的高度</param>
         public Bitmap FD(Bitmap oldBitmap, int Width, int Height)
         {
             Bitmap newBitmap = new Bitmap(Width, Height);
             Color color1, color2;
             for (int x = ; x < Width - ; x++)
             {
                 for (int y = ; y < Height - ; y++)
                 {
                     int r = , g = , b = ;
                     color1 = oldBitmap.GetPixel(x, y);
                     color2 = oldBitmap.GetPixel(x + , y + );
                     r = Math.Abs(color1.R - color2.R + );
                     g = Math.Abs(color1.G - color2.G + );
                     b = Math.Abs(color1.B - color2.B + );
                     if (r > ) r = ;
                     if (r < ) r = ;
                     if (g > ) g = ;
                     if (g < ) g = ;
                     if (b > ) b = ;
                     if (b < ) b = ;
                     newBitmap.SetPixel(x, y, Color.FromArgb(r, g, b));
                 }
             }
             return newBitmap;
         }
         #endregion

         #region 拉伸图片
         /// <summary>
         /// 拉伸图片
         /// </summary>
         /// <param name="bmp">原始图片</param>
         /// <param name="newW">新的宽度</param>
         /// <param name="newH">新的高度</param>
         public static Bitmap ResizeImage(Bitmap bmp, int newW, int newH)
         {
             try
             {
                 Bitmap bap = new Bitmap(newW, newH);
                 Graphics g = Graphics.FromImage(bap);
                 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                 g.DrawImage(bap, new Rectangle(, , newW, newH), new Rectangle(, , bap.Width, bap.Height), GraphicsUnit.Pixel);
                 g.Dispose();
                 return bap;
             }
             catch
             {
                 return null;
             }
         }
         #endregion

         #region 滤色处理
         /// <summary>
         /// 滤色处理
         /// </summary>
         /// <param name="mybm">原始图片</param>
         /// <param name="width">原始图片的长度</param>
         /// <param name="height">原始图片的高度</param>
         public Bitmap FilPic(Bitmap mybm, int width, int height)
         {
             Bitmap bm = new Bitmap(width, height);//初始化一个记录滤色效果的图片对象
             int x, y;
             Color pixel;

             for (x = ; x < width; x++)
             {
                 for (y = ; y < height; y++)
                 {
                     pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
                     bm.SetPixel(x, y, Color.FromArgb(, pixel.G, pixel.B));//绘图
                 }
             }
             return bm;
         }
         #endregion

         #region 左右翻转
         /// <summary>
         /// 左右翻转
         /// </summary>
         /// <param name="mybm">原始图片</param>
         /// <param name="width">原始图片的长度</param>
         /// <param name="height">原始图片的高度</param>
         public Bitmap RevPicLR(Bitmap mybm, int width, int height)
         {
             Bitmap bm = new Bitmap(width, height);
             int x, y, z; //x,y是循环次数,z是用来记录像素点的x坐标的变化的
             Color pixel;
             for (y = height - ; y >= ; y--)
             {
                 for (x = width - , z = ; x >= ; x--)
                 {
                     pixel = mybm.GetPixel(x, y);//获取当前像素的值
                     bm.SetPixel(z++, y, Color.FromArgb(pixel.R, pixel.G, pixel.B));//绘图
                 }
             }
             return bm;
         }
         #endregion

         #region 上下翻转
         /// <summary>
         /// 上下翻转
         /// </summary>
         /// <param name="mybm">原始图片</param>
         /// <param name="width">原始图片的长度</param>
         /// <param name="height">原始图片的高度</param>
         public Bitmap RevPicUD(Bitmap mybm, int width, int height)
         {
             Bitmap bm = new Bitmap(width, height);
             int x, y, z;
             Color pixel;
             for (x = ; x < width; x++)
             {
                 for (y = height - , z = ; y >= ; y--)
                 {
                     pixel = mybm.GetPixel(x, y);//获取当前像素的值
                     bm.SetPixel(x, z++, Color.FromArgb(pixel.R, pixel.G, pixel.B));//绘图
                 }
             }
             return bm;
         }
         #endregion

         #region 压缩图片
         /// <summary>
         /// 压缩到指定尺寸
         /// </summary>
         /// <param name="oldfile">原文件</param>
         /// <param name="newfile">新文件</param>
         public bool Compress(string oldfile, string newfile)
         {
             try
             {
                 System.Drawing.Image img = System.Drawing.Image.FromFile(oldfile);
                 System.Drawing.Imaging.ImageFormat thisFormat = img.RawFormat;
                 Size newSize = new Size(, );
                 Bitmap outBmp = new Bitmap(newSize.Width, newSize.Height);
                 Graphics g = Graphics.FromImage(outBmp);
                 g.CompositingQuality = CompositingQuality.HighQuality;
                 g.SmoothingMode = SmoothingMode.HighQuality;
                 g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                 g.DrawImage(img, new Rectangle(, , newSize.Width, newSize.Height), , , img.Width, img.Height, GraphicsUnit.Pixel);
                 g.Dispose();
                 EncoderParameters encoderParams = new EncoderParameters();
                 long[] quality = new long[];
                 quality[] = ;
                 EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
                 encoderParams.Param[] = encoderParam;
                 ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
                 ImageCodecInfo jpegICI = null;
                 for (int x = ; x < arrayICI.Length; x++)
                     if (arrayICI[x].FormatDescription.Equals("JPEG"))
                     {
                         jpegICI = arrayICI[x]; //设置JPEG编码
                         break;
                     }
                 img.Dispose();
                 if (jpegICI != null) outBmp.Save(newfile, System.Drawing.Imaging.ImageFormat.Jpeg);
                 outBmp.Dispose();
                 return true;
             }
             catch
             {
                 return false;
             }
         }
         #endregion

         #region 图片灰度化
         public Color Gray(Color c)
         {
             int rgb = Convert.ToInt32((double)(((0.3 * c.R) + (0.59 * c.G)) + (0.11 * c.B)));
             return Color.FromArgb(rgb, rgb, rgb);
         }
         #endregion

         #region 转换为黑白图片
         /// <summary>
         /// 转换为黑白图片
         /// </summary>
         /// <param name="mybt">要进行处理的图片</param>
         /// <param name="width">图片的长度</param>
         /// <param name="height">图片的高度</param>
         public Bitmap BWPic(Bitmap mybm, int width, int height)
         {
             Bitmap bm = new Bitmap(width, height);
             int x, y, result; //x,y是循环次数，result是记录处理后的像素值
             Color pixel;
             for (x = ; x < width; x++)
             {
                 for (y = ; y < height; y++)
                 {
                     pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
                     result = (pixel.R + pixel.G + pixel.B) / ;//取红绿蓝三色的平均值
                     bm.SetPixel(x, y, Color.FromArgb(result, result, result));
                 }
             }
             return bm;
         }
         #endregion

         #region 获取图片中的各帧
         /// <summary>
         /// 获取图片中的各帧
         /// </summary>
         /// <param name="pPath">图片路径</param>
         /// <param name="pSavePath">保存路径</param>
         public void GetFrames(string pPath, string pSavedPath)
         {
             Image gif = Image.FromFile(pPath);
             FrameDimension fd = new FrameDimension(gif.FrameDimensionsList[]);
             int count = gif.GetFrameCount(fd); //获取帧数(gif图片可能包含多帧，其它格式图片一般仅一帧)
             for (int i = ; i < count; i++)    //以Jpeg格式保存各帧
             {
                 gif.SelectActiveFrame(fd, i);
                 gif.Save(pSavedPath + "\\frame_" + i + ".jpg", ImageFormat.Jpeg);
             }
         }
         #endregion
     }
 }