C#图片切割、图片压缩、缩略图生成代码汇总

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

/// 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;
}