C# 切图
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>/// 圖片處理/// http://www.cnblogs.com/wu-jian//// /// 吳劍 2011-02-20 創建/// 吳劍 2012-08-08 修改/// </summary>public class Image{#region 正方型裁剪并縮放/// <summary>/// 正方型裁剪/// 以圖片中心為軸心，截取正方型，然后等比縮放/// 用于頭像處理/// </summary>/// <remarks>吳劍 2012-08-08</remarks>/// <param name="fromFile">原圖Stream對象</param>/// <param name="fileSaveUrl">縮略圖存放地址</param>/// <param name="side">指定的邊長（正方型）</param>/// <param name="quality">質量（范圍0-100）</param>public static void CutForSquare(System.IO.Stream fromFile, string fileSaveUrl, int side, int quality){//創建目錄string dir = Path.GetDirectoryName(fileSaveUrl);if (!Directory.Exists(dir))Directory.CreateDirectory(dir);//原始圖片（獲取原始圖片創建對象，并使用流中嵌入的顏色管理信息）System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);//原圖寬高均小于模版，不作處理，直接保存if (initImage.Width <= side && initImage.Height <= side){initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);}else{//原始圖片的寬、高int initWidth = initImage.Width;int initHeight = initImage.Height;//非正方型先裁剪為正方型if (initWidth != initHeight){//截圖對象System.Drawing.Image pickedImage = null;System.Drawing.Graphics pickedG = null;//寬大于高的橫圖if (initWidth > initHeight){//對象實例化pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);pickedG = System.Drawing.Graphics.FromImage(pickedImage);//設置質量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);//畫圖
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);//重置寬initWidth = initHeight;}//高大于寬的豎圖else{//對象實例化pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);pickedG = System.Drawing.Graphics.FromImage(pickedImage);//設置質量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);//畫圖
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);//重置高initHeight = initWidth;}//將截圖對象賦給原圖initImage = (System.Drawing.Image)pickedImage.Clone();//釋放截圖資源
pickedG.Dispose();pickedImage.Dispose();}//縮略圖對象System.Drawing.Image resultImage = new System.Drawing.Bitmap(side, side);System.Drawing.Graphics resultG = System.Drawing.Graphics.FromImage(resultImage);//設置質量resultG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;resultG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//用指定背景色清空畫布
resultG.Clear(Color.White);//繪制縮略圖resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel);//關鍵質量控制//獲取系統編碼類型數組,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);//保存縮略圖
resultImage.Save(fileSaveUrl, ici, ep);//釋放關鍵質量控制所用資源
ep.Dispose();//釋放縮略圖資源
resultG.Dispose();resultImage.Dispose();//釋放原始圖片資源
initImage.Dispose();}}#endregion#region 自定義裁剪并縮放/// <summary>/// 指定長寬裁剪/// 按模版比例最大范圍的裁剪圖片并縮放至模版尺寸/// </summary>/// <remarks>吳劍 2012-08-08</remarks>/// <param name="fromFile">原圖Stream對象</param>/// <param name="fileSaveUrl">保存路徑</param>/// <param name="maxWidth">最大寬(單位:px)</param>/// <param name="maxHeight">最大高(單位:px)</param>/// <param name="quality">質量（范圍0-100）</param>public static void CutForCustom(System.IO.Stream fromFile, string fileSaveUrl, int maxWidth, int maxHeight, int quality){//從文件獲取原始圖片，并使用流中嵌入的顏色管理信息System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);//原圖寬高均小于模版，不作處理，直接保存if (initImage.Width <= maxWidth && initImage.Height <= maxHeight){initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);}else{//模版的寬高比例double templateRate = (double)maxWidth / maxHeight;//原圖片的寬高比例double initRate = (double)initImage.Width / initImage.Height;//原圖與模版比例相等，直接縮放if (templateRate == initRate){//按模版大小生成最終圖片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);}//原圖與模版比例不等，裁剪后縮放else{//裁剪對象System.Drawing.Image pickedImage = null;System.Drawing.Graphics pickedG = null;//定位Rectangle fromR = new Rectangle(0, 0, 0, 0);//原圖裁剪定位Rectangle toR = new Rectangle(0, 0, 0, 0);//目標定位//寬為標準進行裁剪if (templateRate > initRate){//裁剪對象實例化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);//裁剪目標定位toR.X = 0;toR.Y = 0;toR.Width = initImage.Width;toR.Height = (int)System.Math.Floor(initImage.Width / templateRate);}//高為標準進行裁剪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;}//設置質量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);//按模版大小生成最終圖片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);//關鍵質量控制//獲取系統編碼類型數組,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);//保存縮略圖
templateImage.Save(fileSaveUrl, ici, ep);//templateImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);//釋放資源
templateG.Dispose();templateImage.Dispose();pickedG.Dispose();pickedImage.Dispose();}}//釋放資源
initImage.Dispose();}#endregion#region 等比縮放/// <summary>/// 圖片等比縮放/// </summary>/// <remarks>吳劍 2012-08-08</remarks>/// <param name="fromFile">原圖Stream對象</param>/// <param name="savePath">縮略圖存放地址</param>/// <param name="targetWidth">指定的最大寬度</param>/// <param name="targetHeight">指定的最大高度</param>/// <param name="watermarkText">水印文字(為""表示不使用水印)</param>/// <param name="watermarkImage">水印圖片路徑(為""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){//創建目錄string dir = Path.GetDirectoryName(savePath);if (!Directory.Exists(dir))Directory.CreateDirectory(dir);//原始圖片（獲取原始圖片創建對象，并使用流中嵌入的顏色管理信息）System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);//原圖寬高均小于模版，不作處理，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("黑體", 10);System.Drawing.Brush brushWater = new SolidBrush(Color.White);gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10);gWater.Dispose();}}//透明圖片水印if (watermarkImage != ""){if (File.Exists(watermarkImage)){//獲取水印圖片using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage)){//水印繪制條件：原始圖片寬高均大于或等于水印圖片if (initImage.Width >= wrImage.Width && initImage.Height >= wrImage.Height){Graphics gWater = Graphics.FromImage(initImage);//透明屬性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{//縮略圖寬、高計算double newWidth = initImage.Width;double newHeight = initImage.Height;//寬大于高或寬等于高（橫圖或正方）if (initImage.Width > initImage.Height || initImage.Width == initImage.Height){//如果寬大于模版if (initImage.Width > targetWidth){//寬按模版，高按比例縮放newWidth = targetWidth;newHeight = initImage.Height * (targetWidth / initImage.Width);}}//高大于寬（豎圖）else{//如果高大于模版if (initImage.Height > targetHeight){//高按模版，寬按比例縮放newHeight = targetHeight;newWidth = initImage.Width * (targetHeight / initImage.Height);}}//生成新圖//新建一個bmp圖片System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight);//新建一個畫板System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage);//設置質量newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//置背景色
newG.Clear(Color.White);//畫圖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("宋體", 10);System.Drawing.Brush brushWater = new SolidBrush(Color.White);gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10);gWater.Dispose();}}//透明圖片水印if (watermarkImage != ""){if (File.Exists(watermarkImage)){//獲取水印圖片using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage)){//水印繪制條件：原始圖片寬高均大于或等于水印圖片if (newImage.Width >= wrImage.Width && newImage.Height >= wrImage.Height){Graphics gWater = Graphics.FromImage(newImage);//透明屬性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();}}}//保存縮略圖
newImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg);//釋放資源
newG.Dispose();newImage.Dispose();initImage.Dispose();}}#endregion#region 其它/// <summary>/// 判斷文件類型是否為WEB格式圖片/// (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
}
轉自http://www.cnblogs.com/wu-jian/
轉載于:https://www.cnblogs.com/LiMin/archive/2013/04/27/3046823.html
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