C#图片压缩、生成缩略图、添加水印模块_

1、C#图片压缩、生成缩略图、添加水印模块_ C#图片处理工具类，可以压缩JPG图像，图片自动生成缩略图，为图片添加水印效果等，返回高清缩略图，得到最佳的图片比例缩放尺寸，并猎取图片类型等，类代码如下： view sourceprint?001using System; 002using System.Collections.Generic; 003using System.Linq; 004using System.Text; 005using System.IO; 006using System.Drawing; 007using System.Drawing.Drawing2D; 008us

2、ing System.Drawing.Imaging; 009namespace CLB.Utility.Tools 010 011 / 012 / 图片工具类 013 / 014 public static class ImageHelper 015 016 / 017 / 压缩JPG图片 018 / 019 / 压缩后图片存放的地址 020 / 需要压缩的图片地址 021 / 压缩质量：假如为0则默认调整为80 022 public static void SetCompressImage(string NewfileName, string OldfileName, long quali

3、ty) 023 024 if (quality = 0) 025 026 quality = 80; 027 028 using (Bitmap bitmp = new Bitmap(OldfileName) 029 030 EncoderParameters ep = new EncoderParameters(1); 031 ep.Param0 = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality); 032 ImageCodecInfo myImageCodecInfo = GetEncoderInf

4、o(image/jpeg); 033 bitmp.Save(NewfileName, myImageCodecInfo, ep); 034 bitmp.Dispose(); 035 036 037 / 038 / 返回高清缩略图 039 / 040 / 原文件 041 / 新文件 042 / 最大高度 043 / 最大宽度 044 / 质量，假如为0，则设为80 045 public static void SetGoodImage(string fileName, string newFile, int maxHeight, int maxWidth,longqualitys) 046 04

5、7 if (qualitys = 0) 048 049 qualitys = 80; 050 051 using (System.Drawing.Image img = System.Drawing.Image.FromFile(fileName) 052 053 System.Drawing.Imaging.ImageFormat 054 thisFormat = img.RawFormat; 055 Size newSize = NewSize(maxWidth, maxHeight, img.Width, img.Height); 056 Bitmap outBmp = new Bitm

6、ap(newSize.Width, newSize.Height); 057 Graphics g = Graphics.FromImage(outBmp); 058 / 设置画布的描绘质量 059 g.CompositingQuality = CompositingQuality.HighQuality; 060 g.SmoothingMode = SmoothingMode.HighQuality; 061 g.InterpolationMode = InterpolationMode.HighQualityBicubic; 062 g.DrawImage(img, new Rectang

7、le(0, 0, newSize.Width, newSize.Height), 063 0, 0, img.Width, img.Height, GraphicsUnit.Pixel); 064 g.Dispose(); 065 / 以下代码为保存图片时,设置压缩质量 066 EncoderParameters encoderParams = new EncoderParameters(); 067 long quality = new long1; 068 quality0 = qualitys; 069 EncoderParameter encoderParam = new Encode

8、rParameter(System.Drawing.Imaging.Encoder.Quality, quality); 070 encoderParams.Param0 = encoderParam; 071 /获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象. 072 ImageCodecInfo arrayICI = ImageCodecInfo.GetImageEncoders(); 073 ImageCodecInfo jpegICI = null; 074 for (int x = 0; 075 x arrayICI.Length; 076 x+) 077

9、078 if (arrayICIx.FormatDescription.Equals(JPEG) 079 080 jpegICI = arrayICIx; 081 /设置JPEG编码 082 break; 083 084 085 if (jpegICI != null) 086 087 outBmp.Save(newFile, jpegICI, encoderParams); 088 089 else 090 091 outBmp.Save(newFile, thisFormat); 092 093 img.Dispose(); 094 outBmp.Dispose(); 095 096 09

10、7 / 得到到按比例最佳尺寸 098 private static Size NewSize(int maxWidth, int maxHeight, int width, int height) 099 100 double w = 0.0; 101 double h = 0.0; 102 double sw = Convert.ToDouble(width); 103 double sh = Convert.ToDouble(height); 104 double mw = Convert.ToDouble(maxWidth); 105 double mh = Convert.ToDoub

11、le(maxHeight); 106 if (sw mw sh mh) 107 108 w = sw; 109 h = sh; 110 111 else if (sw / sh) (mw / mh) 112 113 w = maxWidth; 114 h = (w * sh) / sw; 115 116 else 117 118 h = maxHeight; 119 w = (h * sw) / sh; 120 121 return new Size(Convert.ToInt32(w), Convert.ToInt32(h); 122 123 / 124 / 得到图片类型 125 / 126

12、 / 127 / 128 private static ImageCodecInfo GetEncoderInfo(String mimeType) 129 130 int j; 131 ImageCodecInfo encoders; 132 encoders = ImageCodecInfo.GetImageEncoders(); 133 for (j = 0; j encoders.Length; +j) 134 135 if (encodersj.MimeType = mimeType) 136 return encodersj; 137 138 return null; 139 14

13、0 / 141 / 添加水印效果 142 / 143 / 输入路径 144 / 输出路径 145 / 水印文件路径 146 / 水印靠近图片右边的像素 147 / 水印靠近底边的像素 148 / 透亮度 149 public static void SetWaterMark( string fileName, string newfileName,string WaterImg,int RightSpace,intBottomSpace,int LucencyPercent) 150 151 using (System.Drawing.Image image = System.Drawing.Image.FromFile(fileName) 152 153 ImageModification wm = new ImageModification(); 154 wm.DrawedImagePath = WaterImg; /水印图片 155 wm.ModifyImagePath = fileName; /图片的路径 156 wm.RightSpace = RightSpace; /水