using system; using system.collections.generic; using system.text; using system.io; using system.drawing; using system.drawing.drawing2d; using system.drawing.imaging; namespace wujian.common {     /// <summary>     /// 图片处理类     /// </summary>     public class ptimage     {         #region 正方型裁剪并缩放         /// <summary>         /// 正方型裁剪         /// 以图片中心为轴心，截取正方型，然后等比缩放         /// 用于头像处理         /// </summary>         /// <param name="postedfile">原图httppostedfile对象</param>         /// <param name="filesaveurl">缩略图存放地址</param>         /// <param name="side">指定的边长（正方型）</param>         /// <param name="quality">质量（范围0-100）</param>         public static void cutforsquare(system.web.httppostedfile postedfile, string filesaveurl, int side, int quality)         {             //创建目录             string dir = path.getdirectoryname(filesaveurl);             if (!directory.exists(dir))                 directory.createdirectory(dir);             //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）             system.drawing.image initimage = system.drawing.image.fromstream(postedfile.inputstream, true);             //原图宽高均小于模版，不作处理，直接保存             if (initimage.width <= side && initimage.height <= side)             {                 initimage.save(filesaveurl, system.drawing.imaging.imageformat.jpeg);             }             else             {                 //原始图片的宽、高                 int initwidth = initimage.width;                 int initheight = initimage.height;                 //非正方型先裁剪为正方型                 if (initwidth != initheight)                 {                     //截图对象                     system.drawing.image pickedimage = null;                     system.drawing.graphics pickedg = null;                     //宽大于高的横图                     if (initwidth > initheight)                     {                         //对象实例化                         pickedimage = new system.drawing.bitmap(initheight, initheight);                         pickedg = system.drawing.graphics.fromimage(pickedimage);                         //设置质量                         pickedg.interpolationmode = system.drawing.drawing2d.interpolationmode.highqualitybicubic;                         pickedg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                         //定位                         rectangle fromr = new rectangle((initwidth - initheight) / 2, 0, initheight, initheight);                         rectangle tor = new rectangle(0, 0, initheight, initheight);                         //画图                         pickedg.drawimage(initimage, tor, fromr, system.drawing.graphicsunit.pixel);                         //重置宽                         initwidth = initheight;                     }                     //高大于宽的竖图                     else                     {                         //对象实例化                         pickedimage = new system.drawing.bitmap(initwidth, initwidth);                         pickedg = system.drawing.graphics.fromimage(pickedimage);                         //设置质量                         pickedg.interpolationmode = system.drawing.drawing2d.interpolationmode.highqualitybicubic;                         pickedg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                         //定位                         rectangle fromr = new rectangle(0, (initheight - initwidth) / 2, initwidth, initwidth);                         rectangle tor = new rectangle(0, 0, initwidth, initwidth);                         //画图                         pickedg.drawimage(initimage, tor, fromr, system.drawing.graphicsunit.pixel);                         //重置高                         initheight = initwidth;                     }                     //将截图对象赋给原图                     initimage = (system.drawing.image)pickedimage.clone();                     //释放截图资源                     pickedg.dispose();                     pickedimage.dispose();                 }                 //缩略图对象                 system.drawing.image resultimage = new system.drawing.bitmap(side, side);                 system.drawing.graphics resultg = system.drawing.graphics.fromimage(resultimage);                 //设置质量                 resultg.interpolationmode = system.drawing.drawing2d.interpolationmode.highqualitybicubic;                 resultg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                 //用指定背景色清空画布                 resultg.clear(color.white);                 //绘制缩略图                 resultg.drawimage(initimage, new system.drawing.rectangle(0, 0, side, side), new system.drawing.rectangle(0, 0, initwidth, initheight), system.drawing.graphicsunit.pixel);                 //关键质量控制                 //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff                 imagecodecinfo[] icis = imagecodecinfo.getimageencoders();                 imagecodecinfo ici = null;                 foreach (imagecodecinfo i in icis)                 {                     if (i.mimetype == "image/jpeg" || i.mimetype == "image/bmp" || i.mimetype == "image/png" || i.mimetype == "image/gif")                     {                         ici = i;                     }                 }                 encoderparameters ep = new encoderparameters(1);                 ep.param[0] = new encoderparameter(system.drawing.imaging.encoder.quality, (long)quality);                 //保存缩略图                 resultimage.save(filesaveurl, ici, ep);                 //释放关键质量控制所用资源                 ep.dispose();                 //释放缩略图资源                 resultg.dispose();                 resultimage.dispose();                 //释放原始图片资源                 initimage.dispose();             }         }         /// <summary>         /// 正方型裁剪         /// 以图片中心为轴心，截取正方型，然后等比缩放         /// 用于头像处理         /// </summary>         /// <param name="postedfile">原图httppostedfile对象</param>         /// <param name="filesaveurl">缩略图存放地址</param>         /// <param name="side">指定的边长（正方型）</param>         /// <param name="quality">质量（范围0-100）</param>         public static void cutforsquare(system.io.stream fromfile, string filesaveurl, int side, int quality)         {             //创建目录             string dir = path.getdirectoryname(filesaveurl);             if (!directory.exists(dir))                 directory.createdirectory(dir);             //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）             system.drawing.image initimage = system.drawing.image.fromstream(fromfile, true);             //原图宽高均小于模版，不作处理，直接保存             if (initimage.width <= side && initimage.height <= side)             {                 initimage.save(filesaveurl, system.drawing.imaging.imageformat.jpeg);             }             else             {                 //原始图片的宽、高                 int initwidth = initimage.width;                 int initheight = initimage.height;                 //非正方型先裁剪为正方型                 if (initwidth != initheight)                 {                     //截图对象                     system.drawing.image pickedimage = null;                     system.drawing.graphics pickedg = null;                     //宽大于高的横图                     if (initwidth > initheight)                     {                         //对象实例化                         pickedimage = new system.drawing.bitmap(initheight, initheight);                         pickedg = system.drawing.graphics.fromimage(pickedimage);                         //设置质量                         pickedg.interpolationmode = system.drawing.drawing2d.interpolationmode.highqualitybicubic;                         pickedg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                         //定位                         rectangle fromr = new rectangle((initwidth - initheight) / 2, 0, initheight, initheight);                         rectangle tor = new rectangle(0, 0, initheight, initheight);                         //画图                         pickedg.drawimage(initimage, tor, fromr, system.drawing.graphicsunit.pixel);                         //重置宽                         initwidth = initheight;                     }                     //高大于宽的竖图                     else                     {                         //对象实例化                         pickedimage = new system.drawing.bitmap(initwidth, initwidth);                         pickedg = system.drawing.graphics.fromimage(pickedimage);                         //设置质量                         pickedg.interpolationmode = system.drawing.drawing2d.interpolationmode.highqualitybicubic;                         pickedg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                         //定位                         rectangle fromr = new rectangle(0, (initheight - initwidth) / 2, initwidth, initwidth);                         rectangle tor = new rectangle(0, 0, initwidth, initwidth);                         //画图                         pickedg.drawimage(initimage, tor, fromr, system.drawing.graphicsunit.pixel);                         //重置高                         initheight = initwidth;                     }                     //将截图对象赋给原图                     initimage = (system.drawing.image)pickedimage.clone();                     //释放截图资源                     pickedg.dispose();                     pickedimage.dispose();                 }                 //缩略图对象                 system.drawing.image resultimage = new system.drawing.bitmap(side, side);                 system.drawing.graphics resultg = system.drawing.graphics.fromimage(resultimage);                 //设置质量                 resultg.interpolationmode = system.drawing.drawing2d.interpolationmode.highqualitybicubic;                 resultg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                 //用指定背景色清空画布                 resultg.clear(color.white);                 //绘制缩略图                 resultg.drawimage(initimage, new system.drawing.rectangle(0, 0, side, side), new system.drawing.rectangle(0, 0, initwidth, initheight), system.drawing.graphicsunit.pixel);                 //关键质量控制                 //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff                 imagecodecinfo[] icis = imagecodecinfo.getimageencoders();                 imagecodecinfo ici = null;                 foreach (imagecodecinfo i in icis)                 {                     if (i.mimetype == "image/jpeg" || i.mimetype == "image/bmp" || i.mimetype == "image/png" || i.mimetype == "image/gif")                     {                         ici = i;                     }                 }                 encoderparameters ep = new encoderparameters(1);                 ep.param[0] = new encoderparameter(system.drawing.imaging.encoder.quality, (long)quality);                 //保存缩略图                 resultimage.save(filesaveurl, ici, ep);                 //释放关键质量控制所用资源                 ep.dispose();                 //释放缩略图资源                 resultg.dispose();                 resultimage.dispose();                 //释放原始图片资源                 initimage.dispose();             }         }         #endregion         #region 固定模版裁剪并缩放         /// <summary>         /// 指定长宽裁剪         /// 按模版比例最大范围的裁剪图片并缩放至模版尺寸         /// </summary>         /// <param name="postedfile">原图httppostedfile对象</param>         /// <param name="filesaveurl">保存路径</param>         /// <param name="maxwidth">最大宽(单位:px)</param>         /// <param name="maxheight">最大高(单位:px)</param>         /// <param name="quality">质量（范围0-100）</param>         public static void cutforcustom(system.web.httppostedfile postedfile, string filesaveurl, int maxwidth, int maxheight, int quality)         {             //从文件获取原始图片，并使用流中嵌入的颜色管理信息             system.drawing.image initimage = system.drawing.image.fromstream(postedfile.inputstream, true);             //原图宽高均小于模版，不作处理，直接保存             if (initimage.width <= maxwidth && initimage.height <= maxheight)             {                 initimage.save(filesaveurl, system.drawing.imaging.imageformat.jpeg);             }             else             {                 //模版的宽高比例                 double templaterate = (double)maxwidth / maxheight;                 //原图片的宽高比例                 double initrate = (double)initimage.width / initimage.height;                 //原图与模版比例相等，直接缩放                 if (templaterate == initrate)                 {                     //按模版大小生成最终图片                     system.drawing.image templateimage = new system.drawing.bitmap(maxwidth, maxheight);                     system.drawing.graphics templateg = system.drawing.graphics.fromimage(templateimage);                     templateg.interpolationmode = system.drawing.drawing2d.interpolationmode.high;                     templateg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                     templateg.clear(color.white);                     templateg.drawimage(initimage, new system.drawing.rectangle(0, 0, maxwidth, maxheight), new system.drawing.rectangle(0, 0, initimage.width, initimage.height), system.drawing.graphicsunit.pixel);                     templateimage.save(filesaveurl, system.drawing.imaging.imageformat.jpeg);                 }                 //原图与模版比例不等，裁剪后缩放                 else                 {                     //裁剪对象                     system.drawing.image pickedimage = null;                     system.drawing.graphics pickedg = null;                     //定位                     rectangle fromr = new rectangle(0, 0, 0, 0);//原图裁剪定位                     rectangle tor = new rectangle(0, 0, 0, 0);//目标定位                     //宽为标准进行裁剪                     if (templaterate > initrate)                     {                         //裁剪对象实例化                         pickedimage = new system.drawing.bitmap(initimage.width, (int)math.floor(initimage.width / templaterate));                         pickedg = system.drawing.graphics.fromimage(pickedimage);                         //裁剪源定位                         fromr.x = 0;                         fromr.y = (int)math.floor((initimage.height - initimage.width / templaterate) / 2);                         fromr.width = initimage.width;                         fromr.height = (int)math.floor(initimage.width / templaterate);                         //裁剪目标定位                         tor.x = 0;                         tor.y = 0;                         tor.width = initimage.width;                         tor.height = (int)math.floor(initimage.width / templaterate);                     }                     //高为标准进行裁剪                     else                     {                         pickedimage = new system.drawing.bitmap((int)math.floor(initimage.height * templaterate), initimage.height);                         pickedg = system.drawing.graphics.fromimage(pickedimage);                         fromr.x = (int)math.floor((initimage.width - initimage.height * templaterate) / 2);                         fromr.y = 0;                         fromr.width = (int)math.floor(initimage.height * templaterate);                         fromr.height = initimage.height;                         tor.x = 0;                         tor.y = 0;                         tor.width = (int)math.floor(initimage.height * templaterate);                         tor.height = initimage.height;                     }                     //设置质量                     pickedg.interpolationmode = system.drawing.drawing2d.interpolationmode.highqualitybicubic;                     pickedg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                     //裁剪                     pickedg.drawimage(initimage, tor, fromr, system.drawing.graphicsunit.pixel);                     //按模版大小生成最终图片                     system.drawing.image templateimage = new system.drawing.bitmap(maxwidth, maxheight);                     system.drawing.graphics templateg = system.drawing.graphics.fromimage(templateimage);                     templateg.interpolationmode = system.drawing.drawing2d.interpolationmode.high;                     templateg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                     templateg.clear(color.white);                     templateg.drawimage(pickedimage, new system.drawing.rectangle(0, 0, maxwidth, maxheight), new system.drawing.rectangle(0, 0, pickedimage.width, pickedimage.height), system.drawing.graphicsunit.pixel);                     //关键质量控制                     //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff                     imagecodecinfo[] icis = imagecodecinfo.getimageencoders();                     imagecodecinfo ici = null;                     foreach (imagecodecinfo i in icis)                     {                         if (i.mimetype == "image/jpeg" || i.mimetype == "image/bmp" || i.mimetype == "image/png" || i.mimetype == "image/gif")                         {                             ici = i;                         }                     }                     encoderparameters ep = new encoderparameters(1);                     ep.param[0] = new encoderparameter(system.drawing.imaging.encoder.quality, (long)quality);                     //保存缩略图                     templateimage.save(filesaveurl, ici, ep);                     //templateimage.save(filesaveurl, system.drawing.imaging.imageformat.jpeg);                     //释放资源                     templateg.dispose();                     templateimage.dispose();                     pickedg.dispose();                     pickedimage.dispose();                 }             }             //释放资源             initimage.dispose();         }         #endregion         #region 等比缩放         /// <summary>         /// 图片等比缩放         /// </summary>         /// <param name="postedfile">原图httppostedfile对象</param>         /// <param name="savepath">缩略图存放地址</param>         /// <param name="targetwidth">指定的最大宽度</param>         /// <param name="targetheight">指定的最大高度</param>         /// <param name="watermarktext">水印文字(为""表示不使用水印)</param>         /// <param name="watermarkimage">水印图片路径(为""表示不使用水印)</param>         public static void zoomauto(system.web.httppostedfile postedfile, string savepath, system.double targetwidth, system.double targetheight, string watermarktext, string watermarkimage)         {             //创建目录             string dir = path.getdirectoryname(savepath);             if (!directory.exists(dir))                 directory.createdirectory(dir);             //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）             system.drawing.image initimage = system.drawing.image.fromstream(postedfile.inputstream, true);             //原图宽高均小于模版，不作处理，直接保存             if (initimage.width <= targetwidth && initimage.height <= targetheight)             {                 //文字水印                 if (watermarktext != "")                 {                     using (system.drawing.graphics gwater = system.drawing.graphics.fromimage(initimage))                     {                         system.drawing.font fontwater = new font("黑体", 10);                         system.drawing.brush brushwater = new solidbrush(color.white);                         gwater.drawstring(watermarktext, fontwater, brushwater, 10, 10);                         gwater.dispose();                     }                 }                 //透明图片水印                 if (watermarkimage != "")                 {                     if (file.exists(watermarkimage))                     {                         //获取水印图片                         using (system.drawing.image wrimage = system.drawing.image.fromfile(watermarkimage))                         {                             //水印绘制条件：原始图片宽高均大于或等于水印图片                             if (initimage.width >= wrimage.width && initimage.height >= wrimage.height)                             {                                 graphics gwater = graphics.fromimage(initimage);                                 //透明属性                                 imageattributes imgattributes = new imageattributes();                                 colormap colormap = new colormap();                                 colormap.oldcolor = color.fromargb(255, 0, 255, 0);                                 colormap.newcolor = color.fromargb(0, 0, 0, 0);                                 colormap[] remaptable = { colormap };                                 imgattributes.setremaptable(remaptable, coloradjusttype.bitmap);                                 float[][] colormatrixelements = {                                    new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},                                    new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},                                    new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},                                    new float[] {0.0f,  0.0f,  0.0f,  0.5f, 0.0f},//透明度:0.5                                    new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}                                 };                                 colormatrix wmcolormatrix = new colormatrix(colormatrixelements);                                 imgattributes.setcolormatrix(wmcolormatrix, colormatrixflag.default, coloradjusttype.bitmap);                                 gwater.drawimage(wrimage, new rectangle(initimage.width - wrimage.width, initimage.height - wrimage.height, wrimage.width, wrimage.height), 0, 0, wrimage.width, wrimage.height, graphicsunit.pixel, imgattributes);                                 gwater.dispose();                             }                             wrimage.dispose();                         }                     }                 }                 //保存                 initimage.save(savepath, system.drawing.imaging.imageformat.jpeg);             }             else             {                 //缩略图宽、高计算                 double newwidth = initimage.width;                 double newheight = initimage.height;                 //宽大于高或宽等于高（横图或正方）                 if (initimage.width > initimage.height || initimage.width == initimage.height)                 {                     //如果宽大于模版                     if (initimage.width > targetwidth)                     {                         //宽按模版，高按比例缩放                         newwidth = targetwidth;                         newheight = initimage.height * (targetwidth / initimage.width);                     }                 }                 //高大于宽（竖图）                 else                 {                     //如果高大于模版                     if (initimage.height > targetheight)                     {                         //高按模版，宽按比例缩放                         newheight = targetheight;                         newwidth = initimage.width * (targetheight / initimage.height);                     }                 }                 //生成新图                 //新建一个bmp图片                 system.drawing.image newimage = new system.drawing.bitmap((int)newwidth, (int)newheight);                 //新建一个画板                 system.drawing.graphics newg = system.drawing.graphics.fromimage(newimage);                 //设置质量                 newg.interpolationmode = system.drawing.drawing2d.interpolationmode.highqualitybicubic;                 newg.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;                 //置背景色                 newg.clear(color.white);                 //画图                 newg.drawimage(initimage, new system.drawing.rectangle(0, 0, newimage.width, newimage.height), new system.drawing.rectangle(0, 0, initimage.width, initimage.height), system.drawing.graphicsunit.pixel);                 //文字水印                 if (watermarktext != "")                 {                     using (system.drawing.graphics gwater = system.drawing.graphics.fromimage(newimage))                     {                         system.drawing.font fontwater = new font("宋体", 10);                         system.drawing.brush brushwater = new solidbrush(color.white);                         gwater.drawstring(watermarktext, fontwater, brushwater, 10, 10);         &nb