实现图片的裁切缩放添加水印等

实现图片裁切缩放添加水印

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/// http://www.cnblogs.com/wu-jian//// /// 吴剑 2011-02-20 创建/// 吴剑 2012-08-08 修改/// </summary>public class Image{#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>/// <remarks>吴剑 2012-08-08</remarks>/// <param name="fromFile">原图Stream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,tiffImageCodecInfo[] 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 自定义裁剪并缩放/// <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>/// <remarks>吴剑 2012-08-08</remarks>/// <param name="fromFile">原图Stream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.IO.Stream fromFile, 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(fromFile, 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)System.Math.Floor(initImage.Width / templateRate));pickedG = System.Drawing.Graphics.FromImage(pickedImage);//裁剪源定位fromR.X = 0;fromR.Y = (int)System.Math.Floor((initImage.Height - initImage.Width / templateRate) / 2);fromR.Width = initImage.Width;fromR.Height = (int)System.Math.Floor(initImage.Width / templateRate);//裁剪目标定位toR.X = 0;toR.Y = 0;toR.Width = initImage.Width;toR.Height = (int)System.Math.Floor(initImage.Width / templateRate);}//高为标准进行裁剪else{pickedImage = new System.Drawing.Bitmap((int)System.Math.Floor(initImage.Height * templateRate), initImage.Height);pickedG = System.Drawing.Graphics.FromImage(pickedImage);fromR.X = (int)System.Math.Floor((initImage.Width - initImage.Height * templateRate) / 2);fromR.Y = 0;fromR.Width = (int)System.Math.Floor(initImage.Height * templateRate);fromR.Height = initImage.Height;toR.X = 0;toR.Y = 0;toR.Width = (int)System.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,tiffImageCodecInfo[] 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>/// <remarks>吴剑 2012-08-08</remarks>/// <param name="fromFile">原图Stream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.IO.Stream fromFile, 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(fromFile, 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:0.5new 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);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 (newImage.Width >= wrImage.Width && newImage.Height >= wrImage.Height){Graphics gWater = Graphics.FromImage(newImage);//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:0.5new 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(newImage.Width - wrImage.Width, newImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes);gWater.Dispose();}wrImage.Dispose();}}}//保存缩略图newImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg);//释放资源newG.Dispose();newImage.Dispose();initImage.Dispose();}}#endregion#region 其它/// <summary>/// 判断文件类型是否为WEB格式图片/// (注：JPG,GIF,BMP,PNG)/// </summary>/// <param name="contentType">HttpPostedFile.ContentType</param>/// <returns></returns>public static bool IsWebImage(string contentType){if (contentType == "image/pjpeg" || contentType == "image/jpeg" || contentType == "image/gif" || contentType == "image/bmp" || contentType == "image/png"){return true;}else{return false;}}#endregion}//end class
}

转载自：http://www.cnblogs.com/wu-jian

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