C#图片切割、图片压缩、缩略图生成代码汇总

 /// 图片切割函数 ///  /// 原始图片文件 /// 在Ｘ轴上的切割数量 /// 在Ｙ轴上的切割数量 /// 质量压缩比 /// 输出文件名，不带后缀 /// 成功返回true，失败则返回false public static bool imageCut(String sourceFile, int xNum, int yNum, long quality, String outputFile) { try { long imageQuality      = quality; Bitmap sourceImage      = new Bitmap(sourceFile); ImageCodecInfo myImageCodecInfo   = GetEncoderInfo("image/jpeg"); Encoder myEncoder      = Encoder.Quality; EncoderParameters myEncoderParameters = new EncoderParameters(1); EncoderParameter myEncoderParameter  = new EncoderParameter(myEncoder, imageQuality); myEncoderParameters.Param[0]    = myEncoderParameter; float xWidth        = sourceImage.Width / xNum; float yWidth        = sourceImage.Height / yNum; String outputImage      = ""; for (int countY = 0; countY  /// 图片压缩函数 ///  /// 原始图片文件 /// 质量压缩比 /// 输出文件名,请用 .jpg-600 后缀  /// 成功返回true，失败则返回false public static bool imageCompress(String sourceFile,long quality,String outputFile) { try { long imageQuality      = quality; Bitmap sourceImage      = new Bitmap(sourceFile); ImageCodecInfo myImageCodecInfo  = GetEncoderInfo("image/jpeg"); Encoder myEncoder      = Encoder.Quality; EncoderParameters myEncoderParameters = new EncoderParameters(1); EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality); myEncoderParameters.Param[0]   = myEncoderParameter; sourceImage.Save(outputFile, myImageCodecInfo, myEncoderParameters); return true; } catch { return false; } } #endregion imageCompress getThumImage#region getThumImage /**//// 
 /// 生成缩略图 /// 
 /// 原始图片文件 /// 质量压缩比 /// 收缩倍数 /// 输出文件名 /// 成功返回true,失败则返回false public static bool getThumImage(String sourceFile, long quality, int multiple, String outputFile) { try { long imageQuality      = quality; Bitmap sourceImage      = new Bitmap(sourceFile); ImageCodecInfo myImageCodecInfo  = GetEncoderInfo("image/jpeg"); Encoder myEncoder      = Encoder.Quality; EncoderParameters myEncoderParameters = new EncoderParameters(1); EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality); myEncoderParameters.Param[0]   = myEncoderParameter; float xWidth       = sourceImage.Width; float yWidth       = sourceImage.Height; Bitmap newImage      = new Bitmap((int)(xWidth /multiple), (int)(yWidth /multiple)); Graphics g        = Graphics.FromImage(newImage); g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple); g.Dispose(); newImage.Save(outputFile,myImageCodecInfo,myEncoderParameters); return true; } catch { return false; } } #endregion getThumImage ImageCodecInfo#region ImageCodecInfo /**//// 
 /// 获取图片编码信息 /// 
 private static ImageCodecInfo GetEncoderInfo(String mimeType) { int j; ImageCodecInfo[] encoders; encoders = ImageCodecInfo.GetImageEncoders(); for (j = 0; j