23
2015
12

【C#、Asp.Net 工具类大全】图片通用操作类

对图片进行操作,常用的就是上传及对图片进行裁剪,生成缩略图等

    /// <summary>

    /// jqueryUpImg 图片上传及裁剪

    /// </summary>

    public class jqueryUpImg : IHttpHandler

    {

        private string urlPath = "";


        public void ProcessRequest(HttpContext context)

        {

            context.Response.ContentType = "text/plain";


            string reStr = "{\"status\" : \"error\", \"msg\" : \"上传失败,请重试!\"}";


            HttpFileCollection postedFile = context.Request.Files;

            HttpPostedFile file = postedFile[0];

            urlPath = HttpContext.Current.Server.MapPath("~/upFile/" + @context.Request["name"] + "/");

            string uploadpath = urlPath;


            if (file != null)

            {

                string filetype = Path.GetExtension(file.FileName).ToLower();

                filetype = filetype.ToLower();

                if (filetype == ".png" || filetype == ".jpg" || filetype == ".gif" || filetype == ".bmp" || filetype == ".jpeg" || filetype == ".icon")

                {

                    Random rd = new Random();


                    string oldFileName = file.FileName;

                    string fileNameStr = DateTime.Now.ToString("yyyyMMddhhmmssfff") + rd.Next(100, 999).ToString(); //随机产品文件名

                    string fileName = fileNameStr + filetype;

                    string savepath = uploadpath + fileName;

                    string width = @context.Request["width"];

                    string height = @context.Request["height"];

                    if (File.Exists(savepath))

                    {

                        reStr = "{\"status\" : \"error\", \"msg\" : \"当前图片名称已经存在,请更改!\"}";

                    }

                    else

                    {

                        if (Directory.Exists(uploadpath) == false) //如果不存在就创建file文件夹,防止不存在文件夹是出错

                        {

                            Directory.CreateDirectory(uploadpath);

                        }


                        file.SaveAs(savepath);


                        try

                        {

                            string[] widthStr = width.Split(',');

                            string[] heightStr = height.Split(',');


                            int quality = 100;

                            if (Convert.ToInt32(widthStr[0]) > 600)

                            {

                                quality = 80;

                            }


                            /*规定大小图片,进行切图*/

                            string fileNameStr1 = DateTime.Now.ToString("yyyyMMddhhmmssfff") + rd.Next(1000, 9999).ToString();

                            string fileName1 = fileNameStr1 + filetype;

                            string newpath = uploadpath + fileName1;

                            ImageHelper.MakeThumbnail(savepath, newpath, Convert.ToInt32(widthStr[0]), Convert.ToInt32(heightStr[0]), (heightStr[0] == "0" ? "W" : "Cut"), quality);


                            string fileNameStr2 = DateTime.Now.ToString("yyyyMMddhhmmssfff") + rd.Next(1000, 9999).ToString();

                            string fileName2 = fileNameStr2 + filetype;

                            string newpath1 = uploadpath + fileName2;

                            ImageHelper.MakeThumbnail(newpath, newpath1, Convert.ToInt32(widthStr[1]), Convert.ToInt32(heightStr[1]), (heightStr[1] == "0" ? "W" : "Cut"), quality);


                            string fileNameStr3 = DateTime.Now.ToString("yyyyMMddhhmmssfff") + rd.Next(1000, 9999).ToString();

                            string fileName3 = fileNameStr3 + filetype;

                            string newpath2 = uploadpath + fileName3;

                            ImageHelper.MakeThumbnail(newpath1, newpath2, Convert.ToInt32(widthStr[2]), Convert.ToInt32(heightStr[2]), (heightStr[2] == "0" ? "W" : "Cut"), quality);

                            /*规定大小图片,进行切图*/ 


                            if (File.Exists(newpath))

                            {

                                if (savepath.Trim() != "")

                                {

                                    string img = "../upFile/" + @context.Request["name"] + "/" + fileName;

                                    string imgBig = "../upFile/" + @context.Request["name"] + "/" + fileName1;

                                    string imgMiddle = "../upFile/" + @context.Request["name"] + "/" + fileName2;

                                    string imgSmall = "../upFile/" + @context.Request["name"] + "/" + fileName3;

                                    reStr = "{\"status\" : \"success\", \"img\" : \"" + img + "\", \"imgBig\" : \"" + imgBig + "\", \"imgMiddle\" : \"" + imgMiddle + "\", \"imgSmall\" : \"" + imgSmall + "\"}";

                                } 

                            }

                        }

                        catch

                        {


                        }

                    }

                }

                else

                {

                    reStr = "{\"status\" : \"error\", \"msg\" : \"文件名格式不正确!\"}";

                }

            }

            context.Response.Write(reStr);

        }


        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

    /// <summary>
    /// 图片操作类
    /// </summary>
    public class ImageHelper
    {
        #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>    
        /// <param name="quality">质量(范围1-100) //设置图片质量,越大越清晰文件就越大,100以上设置了也是和100一样的效果:有些没有这个参数,会出现上传超时情况</param>
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode, int quality)
        {
            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);*/ //使用这个,会出现上传超时情况
                //关键质量控制:使用上面注释掉的程序的时候,图片不清晰
                //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
                ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);
                if (originalImagePath.IndexOf("png") != -1)
                {
                    jgpEncoder = GetEncoder(ImageFormat.Png);
                }
                else if (originalImagePath.IndexOf("gif") != -1)
                {
                    jgpEncoder = GetEncoder(ImageFormat.Gif);
                }
                else if (originalImagePath.IndexOf("bmp") != -1)
                {
                    jgpEncoder = GetEncoder(ImageFormat.Bmp);
                }
                else if (originalImagePath.IndexOf("tiff") != -1)
                {
                    jgpEncoder = GetEncoder(ImageFormat.Tiff);
                }
                else if (originalImagePath.IndexOf("icon") != -1)
                {
                    jgpEncoder = GetEncoder(ImageFormat.Icon);
                }
                else if (originalImagePath.IndexOf("wmf") != -1)
                {
                    jgpEncoder = GetEncoder(ImageFormat.Wmf);
                }
                else
                {
                    jgpEncoder = GetEncoder(ImageFormat.Jpeg);
                }
                EncoderParameters ep = new EncoderParameters(1);
                ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);
                //保存缩略图
                bitmap.Save(thumbnailPath, jgpEncoder, ep);
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
        }
        /// <summary>
        /// 图片格式
        /// </summary>
        /// <param name="format"></param>
        /// <returns></returns>
        private static ImageCodecInfo GetEncoder(ImageFormat format)
        {
            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                {
                    return codec;
                }
            }
            return null;
        }
        #endregion
        #region 图片裁剪
        /// <summary>
        /// 裁剪图片并保存
        /// </summary>
        /// <param name="fileName">源图路径(绝对路径)</param>
        /// <param name="newFileName">缩略图路径(绝对路径)</param>
        /// <param name="maxWidth">缩略图宽度</param>
        /// <param name="maxHeight">缩略图高度</param>
        /// <param name="cropWidth">裁剪宽度</param>
        /// <param name="cropHeight">裁剪高度</param>
        /// <param name="X">X轴</param>
        /// <param name="Y">Y轴</param>
        public static bool MakeThumbnailImage(string fileName, string newFileName, int maxWidth, int maxHeight, int cropWidth, int cropHeight, int X, int Y)
        {
            byte[] imageBytes = File.ReadAllBytes(fileName);
            Image originalImage = Image.FromStream(new System.IO.MemoryStream(imageBytes));
            Bitmap b = new Bitmap(cropWidth, cropHeight);
            try
            {
                using (Graphics g = Graphics.FromImage(b))
                {
                    //设置高质量插值法
                    g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    //设置高质量,低速度呈现平滑程度
                    g.SmoothingMode = SmoothingMode.AntiAlias;
                    g.PixelOffsetMode = PixelOffsetMode.HighQuality;
                    //清空画布并以透明背景色填充
                    g.Clear(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 Rectangle(0, 0, cropWidth, cropHeight), X, Y, cropWidth, cropHeight, GraphicsUnit.Pixel);
                    Image displayImage = new Bitmap(b, maxWidth, maxHeight);
                    SaveImage(displayImage, newFileName, GetCodecInfo("image/" + GetFormat(newFileName).ToString().ToLower()));
                    return true;
                }
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                b.Dispose();
            }
        }
        #region 图片裁剪帮助方法
        /// <summary>
        /// 保存图片
        /// </summary>
        /// <param name="image">Image 对象</param>
        /// <param name="savePath">保存路径</param>
        /// <param name="ici">指定格式的编解码参数</param>
        private static void SaveImage(Image image, string savePath, ImageCodecInfo ici)
        {
            //设置 原图片 对象的 EncoderParameters 对象
            EncoderParameters parameters = new EncoderParameters(1);
            parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)100));
            image.Save(savePath, ici, parameters);
            parameters.Dispose();
        }
        /// <summary>
        /// 获取图像编码解码器的所有相关信息
        /// </summary>
        /// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param>
        /// <returns>返回图像编码解码器的所有相关信息</returns>
        private static ImageCodecInfo GetCodecInfo(string mimeType)
        {
            ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
            foreach (ImageCodecInfo ici in CodecInfo)
            {
                if (ici.MimeType == mimeType)
                    return ici;
            }
            return null;
        }
        /// <summary>
        /// 计算新尺寸
        /// </summary>
        /// <param name="width">原始宽度</param>
        /// <param name="height">原始高度</param>
        /// <param name="maxWidth">最大新宽度</param>
        /// <param name="maxHeight">最大新高度</param>
        /// <returns></returns>
        private static Size ResizeImage(int width, int height, int maxWidth, int maxHeight)
        {
            //此次2012-02-05修改过=================
            if (maxWidth <= 0)
                maxWidth = width;
            if (maxHeight <= 0)
                maxHeight = height;
            //以上2012-02-05修改过=================
            decimal MAX_WIDTH = (decimal)maxWidth;
            decimal MAX_HEIGHT = (decimal)maxHeight;
            decimal ASPECT_RATIO = MAX_WIDTH / MAX_HEIGHT;
            int newWidth, newHeight;
            decimal originalWidth = (decimal)width;
            decimal originalHeight = (decimal)height;
            if (originalWidth > MAX_WIDTH || originalHeight > MAX_HEIGHT)
            {
                decimal factor;
                // determine the largest factor 
                if (originalWidth / originalHeight > ASPECT_RATIO)
                {
                    factor = originalWidth / MAX_WIDTH;
                    newWidth = Convert.ToInt32(originalWidth / factor);
                    newHeight = Convert.ToInt32(originalHeight / factor);
                }
                else
                {
                    factor = originalHeight / MAX_HEIGHT;
                    newWidth = Convert.ToInt32(originalWidth / factor);
                    newHeight = Convert.ToInt32(originalHeight / factor);
                }
            }
            else
            {
                newWidth = width;
                newHeight = height;
            }
            return new Size(newWidth, newHeight);
        }
        /// <summary>
        /// 得到图片格式
        /// </summary>
        /// <param name="name">文件名称</param>
        /// <returns></returns>
        public static ImageFormat GetFormat(string name)
        {
            string ext = name.Substring(name.LastIndexOf(".") + 1);
            switch (ext.ToLower())
            {
                case "jpg":
                case "jpeg":
                    return ImageFormat.Jpeg;
                case "bmp":
                    return ImageFormat.Bmp;
                case "png":
                    return ImageFormat.Png;
                case "gif":
                    return ImageFormat.Gif;
                default:
                    return ImageFormat.Jpeg;
            }
        }
        #endregion
        #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)
        {
            return Compress(oldfile, newfile, 100, 125);
        }
        /// <summary>
        /// 压缩指定尺寸,如果写的和图片大家一样表示大小不变,只是把图片压缩下一些
        /// </summary>
        /// <param name="oldfile">原文件</param>
        /// <param name="newfile">新文件</param>
        /// <param name="width">长</param>
        /// <param name="height">高</param>
        public bool Compress(string oldfile, string newfile, int width, int height)
        {
            try
            {
                System.Drawing.Image img = System.Drawing.Image.FromFile(oldfile);
                System.Drawing.Imaging.ImageFormat thisFormat = img.RawFormat;
                Size newSize = new Size(width, height);
                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
        #region 下载图片操作
        /// <summary>
        /// 获取图片标志
        /// </summary>
        private string[] GetImgTag(string htmlStr)
        {
            Regex regObj = new Regex("<img.+?>", RegexOptions.Compiled | RegexOptions.IgnoreCase);
            string[] strAry = new string[regObj.Matches(htmlStr).Count];
            int i = 0;
            foreach (Match matchItem in regObj.Matches(htmlStr))
            {
                strAry[i] = GetImgUrl(matchItem.Value);
                i++;
            }
            return strAry;
        }
        /// <summary>
        /// 获取图片URL地址
        /// </summary>
        private string GetImgUrl(string imgTagStr)
        {
            string str = "";
            Regex regObj = new Regex("http://.+.(?:jpg|gif|bmp|png)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
            foreach (Match matchItem in regObj.Matches(imgTagStr))
            {
                str = matchItem.Value;
            }
            return str;
        }
        /// <summary>
        /// 下载图片到本地
        /// </summary>
        /// <param name="strHTML">HTML</param>
        /// <param name="path">路径</param>
        /// <param name="nowyymm">年月</param>
        /// <param name="nowdd">日</param>
        public string SaveUrlPics(string strHTML, string path)
        {
            string nowym = DateTime.Now.ToString("yyyy-MM");  //当前年月
            string nowdd = DateTime.Now.ToString("dd");       //当天号数
            path = path + nowym + "/" + nowdd;
            if (!Directory.Exists(path)) Directory.CreateDirectory(path);
            string[] imgurlAry = GetImgTag(strHTML);
            try
            {
                for (int i = 0; i < imgurlAry.Length; i++)
                {
                    string preStr = System.DateTime.Now.ToString() + "_";
                    preStr = preStr.Replace("-", "");
                    preStr = preStr.Replace(":", "");
                    preStr = preStr.Replace(" ", "");
                    WebClient wc = new WebClient();
                    wc.DownloadFile(imgurlAry[i], path + "/" + preStr + imgurlAry[i].Substring(imgurlAry[i].LastIndexOf("/") + 1));
                }
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
            return strHTML;
        }
        #endregion
        #region 生成缩略图
        /// <summary>
        /// 生成缩略图,不超出尺寸,比它小就不截了,不留白,大就缩小到最佳尺寸,主要为手机用
        /// </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>
        /// <param name="isaddwatermark">是否添加水印</param>
        /// <param name="imagePosition">水印位置</param>
        /// <param name="waterImage">水印图片名称</param>
        /// <param name="quality">图片品质</param>
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode, bool isaddwatermark, ImagePosition imagePosition, string waterImage = null, int quality = 75)
        {
            Image originalImage = 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 (originalImage.Width >= towidth && originalImage.Height >= toheight)
                    {
                        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;
                        }
                    }
                    else
                    {
                        x = (originalImage.Width - towidth) / 2;
                        y = (originalImage.Height - toheight) / 2;
                        ow = towidth;
                        oh = toheight;
                    }
                    break;
                case "Fit"://不超出尺寸,比它小就不截了,不留白,大就缩小到最佳尺寸,主要为手机用
                    if (originalImage.Width > towidth && originalImage.Height > toheight)
                    {
                        if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                            toheight = originalImage.Height * width / originalImage.Width;
                        else
                            towidth = originalImage.Width * height / originalImage.Height;
                    }
                    else if (originalImage.Width > towidth)
                    {
                        toheight = originalImage.Height * width / originalImage.Width;
                    }
                    else if (originalImage.Height > toheight)
                    {
                        towidth = originalImage.Width * height / originalImage.Height;
                    }
                    else
                    {
                        towidth = originalImage.Width;
                        toheight = originalImage.Height;
                        ow = towidth;
                        oh = toheight;
                    }
                    break;
                default:
                    break;
            }
            //新建一个bmp图片
            Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
            //新建一个画板
            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;
            g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
            g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
            //清空画布并以透明背景色填充
            g.Clear(Color.White);
            //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 Rectangle(0, 0, towidth, toheight),
                new Rectangle(x, y, ow, oh),
                GraphicsUnit.Pixel);
            //加图片水印
            if (isaddwatermark)
            {
                if (string.IsNullOrEmpty(waterImage))
                    waterImage = "watermarker.png";
                Image copyImage = System.Drawing.Image.FromFile(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, waterImage));
                //g.DrawImage(copyImage, new Rectangle(bitmap.Width-copyImage.Width, bitmap.Height-copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
                int xPosOfWm;
                int yPosOfWm;
                int wmHeight = copyImage.Height;
                int wmWidth = copyImage.Width;
                int phHeight = toheight;
                int phWidth = towidth;
                switch (imagePosition)
                {
                    case ImagePosition.LeftBottom:
                        xPosOfWm = 70;
                        yPosOfWm = phHeight - wmHeight - 70;
                        break;
                    case ImagePosition.LeftTop:
                        xPosOfWm = 70;
                        yPosOfWm = 0 - 70;
                        break;
                    case ImagePosition.RightTop:
                        xPosOfWm = phWidth - wmWidth - 70;
                        yPosOfWm = 0 - 70;
                        break;
                    case ImagePosition.RigthBottom:
                        xPosOfWm = phWidth - wmWidth - 70;
                        yPosOfWm = phHeight - wmHeight - 70;
                        break;
                    default:
                        xPosOfWm = 10;
                        yPosOfWm = 0;
                        break;
                }
                g.DrawImage(copyImage, new Rectangle(xPosOfWm, yPosOfWm, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
            }
            // 以下代码为保存图片时,设置压缩质量
            EncoderParameters encoderParams = new EncoderParameters();
            long[] qualityArray = new long[1];
            qualityArray[0] = quality;
            EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityArray);
            encoderParams.Param[0] = encoderParam;
            //获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象.
            ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
            ImageCodecInfo jpegICI = null;
            for (int i = 0; i < arrayICI.Length; i++)
            {
                if (arrayICI[i].FormatDescription.Equals("JPEG"))
                {
                    jpegICI = arrayICI[i];
                    //设置JPEG编码
                    break;
                }
            }
            try
            {
                if (jpegICI != null)
                {
                    bitmap.Save(thumbnailPath, jpegICI, encoderParams);
                }
                else
                {
                    //以jpg格式保存缩略图
                    bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
                }
            }
            catch
            {
                throw;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
        }
        #endregion
    }
    /// <summary>
    /// 水印位置
    /// </summary>
    public enum ImagePosition
    {
        /// <summary>
        /// 默认
        /// </summary>
        Default = 1,
        /// <summary>
        /// 左上
        /// </summary>
        LeftTop = 2,
        /// <summary>
        /// 左下
        /// </summary>
        LeftBottom = 3,
        /// <summary>
        /// 右上
        /// </summary>
        RightTop = 4,
        /// <summary>
        /// 右下
        /// </summary>
        RigthBottom = 5,
        //TopMiddle,     //顶部居中
        //BottomMiddle, //底部居中
        //Center           //中心
    }


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评论列表:

1.宁波租车网  2016/1/6 20:25:15 回复该留言
谢谢分享。。。
2.天意  2016/1/12 17:40:48 回复该留言
你好,我是天意博客博主,你的博客做的非常好,网站内容非常优质,思路清晰,希望能够交个朋友,如果可以万往回访,非常感谢。www.zwebi.com,天意博客敬上。
3.同等学力申硕  2016/1/31 15:00:08 回复该留言
这个程序的东西还是要花时间才能看懂啊,先记一下,慢慢琢磨
谢谢分享
不错

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