C#图片压缩（C#图片缩放）

本文为大家整理了C#图片切割、图片压缩、缩略图生成的实现代码，大家可以收藏，方便以后使用，具体内容如下

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 /// 图片切割函数 /// </summary> /// <param name="sourceFile">原始图片文件</param> /// <param name="xNum">在Ｘ轴上的切割数量</param> /// <param name="yNum">在Ｙ轴上的切割数量</param> /// <param name="quality">质量压缩比</param> /// <param name="outputFile">输出文件名，不带后缀</param> /// <returns>成功返回true，失败则返回false</returns> 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 < yNum; countY++) for (int countX = 0; countX < xNum; countX++) { RectangleF cloneRect = new RectangleF(countX * xWidth, countY * yWidth, xWidth, yWidth); Bitmap newImage = sourceImage.Clone(cloneRect, PixelFormat.Format24bppRgb); outputImage = outputFile + countX + countY + ".jpg"; newImage.Save(outputImage, myImageCodecInfo, myEncoderParameters); } return true; } catch { return false; } } #endregion imageCut imageCompress #region imageCompress /**//// <summary> /// 图片压缩函数 /// </summary> /// <param name="sourceFile">原始图片文件</param> /// <param name="quality">质量压缩比</param> /// <param name="ouputFile">输出文件名,请用 .jpg 后缀 </param> /// <returns>成功返回true，失败则返回false</returns> 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 /**//// <summary> /// 生成缩略图 /// </summary> /// <param name="sourceFile">原始图片文件</param> /// <param name="quality">质量压缩比</param> /// <param name="multiple">收缩倍数</param> /// <param name="outputFile">输出文件名</param> /// <returns>成功返回true,失败则返回false</returns> 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 /**//// <summary> /// 获取图片编码信息 /// </summary> private static ImageCodecInfo GetEncoderInfo(String mimeType) { int j; ImageCodecInfo[] encoders; encoders = ImageCodecInfo.GetImageEncoders(); for (j = 0; j < encoders.Length; ++j) { if (encoders[j].MimeType == mimeType) return encoders[j]; } return null; }