C#图片处理类分享

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

namespace DotNet.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 = 0;
   int y = 0;
   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 = 0;
      x = (originalImage.Width - ow) / 2;
     }
     else
     {
      ow = originalImage.Width;
      oh = originalImage.Width * height / towidth;
      x = 0;
      y = (originalImage.Height - oh) / 2;
     }
     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(0, 0, 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[0].ToString()), int.Parse(loca[1].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 = 0;
   int y = 0;

   if (location == "LT")
   {
    x = 10;
    y = 10;
   }
   else if (location == "T")
   {
    x = img.Width / 2 - waterimg.Width / 2;
    y = img.Height - waterimg.Height;
   }
   else if (location == "RT")
   {
    x = img.Width - waterimg.Width;
    y = 10;
   }
   else if (location == "LC")
   {
    x = 10;
    y = img.Height / 2 - waterimg.Height / 2;
   }
   else if (location == "C")
   {
    x = img.Width / 2 - waterimg.Width / 2;
    y = img.Height / 2 - waterimg.Height / 2;
   }
   else if (location == "RC")
   {
    x = img.Width - waterimg.Width;
    y = img.Height / 2 - waterimg.Height / 2;
   }
   else if (location == "LB")
   {
    x = 10;
    y = img.Height - waterimg.Height;
   }
   else if (location == "B")
   {
    x = img.Width / 2 - waterimg.Width / 2;
    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[0].ToString()), float.Parse(loca[1].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 = 10;
   float y = 10;

   if (location == "LT")
   {
    loca.Add(x);
    loca.Add(y);
   }
   else if (location == "T")
   {
    x = img.Width / 2 - (width * height) / 2;
    loca.Add(x);
    loca.Add(y);
   }
   else if (location == "RT")
   {
    x = img.Width - width * height;
   }
   else if (location == "LC")
   {
    y = img.Height / 2;
   }
   else if (location == "C")
   {
    x = img.Width / 2 - (width * height) / 2;
    y = img.Height / 2;
   }
   else if (location == "RC")
   {
    x = img.Width - height;
    y = img.Height / 2;
   }
   else if (location == "LB")
   {
    y = img.Height - width - 5;
   }
   else if (location == "B")
   {
    x = img.Width / 2 - (width * height) / 2;
    y = img.Height - width - 5;
   }
   else
   {
    x = img.Width - width * height;
    y = img.Height - width - 5;
   }
   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 = 0; x < width; x++)
   {
    for (y = 0; 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 = 0; x < width; x++)
   {
    for (y = 0; y < height; y++)
    {
     pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
     resultR = 255 - pixel.R;//反红
     resultG = 255 - pixel.G;//反绿
     resultB = 255 - 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 = 0; x < Width - 1; x++)
   {
    for (int y = 0; y < Height - 1; y++)
    {
     int r = 0, g = 0, b = 0;
     color1 = oldBitmap.GetPixel(x, y);
     color2 = oldBitmap.GetPixel(x + 1, y + 1);
     r = Math.Abs(color1.R - color2.R + 128);
     g = Math.Abs(color1.G - color2.G + 128);
     b = Math.Abs(color1.B - color2.B + 128);
     if (r > 255) r = 255;
     if (r < 0) r = 0;
     if (g > 255) g = 255;
     if (g < 0) g = 0;
     if (b > 255) b = 255;
     if (b < 0) b = 0;
     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(0, 0, newW, newH), new Rectangle(0, 0, 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 = 0; x < width; x++)
   {
    for (y = 0; y < height; y++)
    {
     pixel = mybm.GetPixel(x, y);//获取当前坐标的像素值
     bm.SetPixel(x, y, Color.FromArgb(0, 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 - 1; y >= 0; y--)
   {
    for (x = width - 1, z = 0; x >= 0; 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 = 0; x < width; x++)
   {
    for (y = height - 1, z = 0; y >= 0; 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(100, 125);
    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(0, 0, newSize.Width, newSize.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
    g.Dispose();
    EncoderParameters encoderParams = new EncoderParameters();
    long[] quality = new long[1];
    quality[0] = 100;
    EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
    encoderParams.Param[0] = encoderParam;
    ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
    ImageCodecInfo jpegICI = null;
    for (int x = 0; 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 = 0; x < width; x++)
   {
    for (y = 0; 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) / 3;//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[0]);
   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 = 0; i < count; i++) //以Jpeg格式保存各帧
   {
    gif.SelectActiveFrame(fd, i);
    gif.Save(pSavedPath + "\\frame_" + i + ".jpg", ImageFormat.Jpeg);
   }
  }
  #endregion
 }
}