【圖片處理】最全的C#圖片處理類ImageHelper.cs <a target=_blank href="http://bbs.cskin.net/forum.php?mod=viewthread&tid=113&fromuid=2446">http://bbs.cskin.net/forum.php?mod=viewthread&tid=113&fromuid=2446</a> (出處: CSkin論壇) 一個很完整的圖片處理類，包含了14個對圖片處理的方法例如：<ul class="litype_1" type="1"><li>生成縮略圖、加圖片水印和文字水印。</li><li>調整量度、反色、浮雕、拉伸、濾色。</li><li>上下左右翻轉、壓縮、灰度化、黑白轉換。</li><li>獲取gif圖片種的每一幀。</li></ul>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 縮略圖/// <summary>/// 生成縮略圖/// </summary>/// <param name="originalImagePath">源圖路徑（物理路徑）</param>/// <param name="thumbnailPath">縮略圖路徑（物理路徑）</param>/// <param name="width">縮略圖寬度</param>/// <param name="height">縮略圖高度</param>/// <param name="mode">生成縮略圖的方式</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": //指定高寬縮放（可能變形） break;case "W": //指定寬，高按比例 toheight = originalImage.Height * width / originalImage.Width;break;case "H": //指定高，寬按比例towidth = originalImage.Width * height / originalImage.Height;break;case "Cut": //指定高寬裁減（不變形） 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;}//新建一個bmp圖片System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);//新建一個畫板System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);//設置高質量插值法g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;//設置高質量,低速度呈現平滑程度g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//清空畫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繪制原圖片的指定部分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格式保存縮略圖bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);}catch (System.Exception e){throw e;}finally{originalImage.Dispose();bitmap.Dispose();g.Dispose();}}#endregion#region 圖片水印/// <summary>/// 圖片水印處理方法/// </summary>/// <param name="path">需要加載水印的圖片路徑（絕對路徑）</param>/// <param name="waterpath">水印圖片（絕對路徑）</param>/// <param name="location">水印位置（傳送正確的代碼）</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>/// 圖片水印位置處理方法/// </summary>/// <param name="location">水印位置</param>/// <param name="img">需要添加水印的圖片</param>/// <param name="waterimg">水印圖片</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>/// 文字水印處理方法/// </summary>/// <param name="path">圖片路徑（絕對路徑）</param>/// <param name="size">字體大小</param>/// <param name="letter">水印文字</param>/// <param name="color">顏色</param>/// <param name="location">水印位置</param>public static string LetterWatermark(string path, int size, string letter, Color color, string location){#regionstring 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("宋體", 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">位置代碼</param>/// <param name="img">圖片對象</param>/// <param name="width">寬(當水印類型為文字時,傳過來的就是字體的大小)</param>/// <param name="height">高(當水印類型為文字時,傳過來的就是字符的長度)</param>private static ArrayList GetLocation(string location, Image img, int width, int height){#regionArrayList loca = new ArrayList(); //定義數組存儲位置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 調整光暗/// <summary>/// 調整光暗/// </summary>/// <param name="mybm">原始圖片</param>/// <param name="width">原始圖片的長度</param>/// <param name="height">原始圖片的高度</param>/// <param name="val">增加或減少的光暗值</param>public Bitmap LDPic(Bitmap mybm, int width, int height, int val){Bitmap bm = new Bitmap(width, height);//初始化一個記錄經過處理后的圖片對象int x, y, resultR, resultG, resultB;//x、y是循環次數，后面三個是記錄紅綠藍三個值的Color pixel;for (x = 0; x < width; x++){for (y = 0; y < height; y++){pixel = mybm.GetPixel(x, y);//獲取當前像素的值resultR = pixel.R + val;//檢查紅色值會不會超出[0, 255]resultG = pixel.G + val;//檢查綠色值會不會超出[0, 255]resultB = pixel.B + val;//檢查藍色值會不會超出[0, 255]bm.SetPixel(x, y, Color.FromArgb(resultR, resultG, resultB));//繪圖}}return bm;}#endregion#region 反色處理/// <summary>/// 反色處理/// </summary>/// <param name="mybm">原始圖片</param>/// <param name="width">原始圖片的長度</param>/// <param name="height">原始圖片的高度</param>public Bitmap RePic(Bitmap mybm, int width, int height){Bitmap bm = new Bitmap(width, height);//初始化一個記錄處理后的圖片的對象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);//獲取當前坐標的像素值resultR = 255 - pixel.R;//反紅resultG = 255 - pixel.G;//反綠resultB = 255 - pixel.B;//反藍bm.SetPixel(x, y, Color.FromArgb(resultR, resultG, resultB));//繪圖}}return bm;}#endregion#region 浮雕處理/// <summary>/// 浮雕處理/// </summary>/// <param name="oldBitmap">原始圖片</param>/// <param name="Width">原始圖片的長度</param>/// <param name="Height">原始圖片的高度</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 拉伸圖片/// <summary>/// 拉伸圖片/// </summary>/// <param name="bmp">原始圖片</param>/// <param name="newW">新的寬度</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 濾色處理/// <summary>/// 濾色處理/// </summary>/// <param name="mybm">原始圖片</param>/// <param name="width">原始圖片的長度</param>/// <param name="height">原始圖片的高度</param>public Bitmap FilPic(Bitmap mybm, int width, int height){Bitmap bm = new Bitmap(width, height);//初始化一個記錄濾色效果的圖片對象int x, y;Color pixel;for (x = 0; x < width; x++){for (y = 0; y < height; y++){pixel = mybm.GetPixel(x, y);//獲取當前坐標的像素值bm.SetPixel(x, y, Color.FromArgb(0, pixel.G, pixel.B));//繪圖}}return bm;}#endregion#region 左右翻轉/// <summary>/// 左右翻轉/// </summary>/// <param name="mybm">原始圖片</param>/// <param name="width">原始圖片的長度</param>/// <param name="height">原始圖片的高度</param>public Bitmap RevPicLR(Bitmap mybm, int width, int height){Bitmap bm = new Bitmap(width, height);int x, y, z; //x,y是循環次數,z是用來記錄像素點的x坐標的變化的Color pixel;for (y = height - 1; y >= 0; y--){for (x = width - 1, z = 0; x >= 0; x--){pixel = mybm.GetPixel(x, y);//獲取當前像素的值bm.SetPixel(z++, y, Color.FromArgb(pixel.R, pixel.G, pixel.B));//繪圖}}return bm;}#endregion#region 上下翻轉/// <summary>/// 上下翻轉/// </summary>/// <param name="mybm">原始圖片</param>/// <param name="width">原始圖片的長度</param>/// <param name="height">原始圖片的高度</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);//獲取當前像素的值bm.SetPixel(x, z++, Color.FromArgb(pixel.R, pixel.G, pixel.B));//繪圖}}return bm;}#endregion#region 壓縮圖片/// <summary>/// 壓縮到指定尺寸/// </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]; //設置JPEG編碼break;}img.Dispose();if (jpegICI != null) outBmp.Save(newfile, System.Drawing.Imaging.ImageFormat.Jpeg);outBmp.Dispose();return true;}catch{return false;}}#endregion#region 圖片灰度化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 轉換為黑白圖片/// <summary>/// 轉換為黑白圖片/// </summary>/// <param name="mybt">要進行處理的圖片</param>/// <param name="width">圖片的長度</param>/// <param name="height">圖片的高度</param>public Bitmap BWPic(Bitmap mybm, int width, int height){Bitmap bm = new Bitmap(width, height);int x, y, result; //x,y是循環次數，result是記錄處理后的像素值Color pixel;for (x = 0; x < width; x++){for (y = 0; y < height; y++){pixel = mybm.GetPixel(x, y);//獲取當前坐標的像素值result = (pixel.R + pixel.G + pixel.B) / 3;//取紅綠藍三色的平均值bm.SetPixel(x, y, Color.FromArgb(result, result, result));}}return bm;}#endregion#region 獲取圖片中的各幀/// <summary>/// 獲取圖片中的各幀/// </summary>/// <param name="pPath">圖片路徑</param>/// <param name="pSavePath">保存路徑</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); //獲取幀數(gif圖片可能包含多幀，其它格式圖片一般僅一幀)for (int i = 0; i < count; i++) //以Jpeg格式保存各幀{gif.SelectActiveFrame(fd, i);gif.Save(pSavedPath + "\\frame_" + i + ".jpg", ImageFormat.Jpeg);}}#endregion} }

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