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/// <summary>
/// 缩小裁剪图片
/// </summary>
/// <param name="int_Width">要缩小裁剪图片宽度</param>
/// <param name="int_Height">要缩小裁剪图片长度</param>
/// <param name="input_ImgUrl">要处理图片路径</param>
/// <param name="out_ImgUrl">处理完毕图片路径</param>
public void ImgReduceCutOut(int int_Width, int int_Height, string input_ImgUrl, string out_ImgUrl) {
// ＝＝＝上传标准图大小＝＝＝
int int_Standard_Width = 160;
int int_Standard_Height = 160;
int Reduce_Width = 0; // 缩小的宽度
int Reduce_Height = 0; // 缩小的高度
int CutOut_Width = 0; // 裁剪的宽度
int CutOut_Height = 0; // 裁剪的高度
int level = 100; //缩略图的质量 1-100的范围
// ＝＝＝获得缩小，裁剪大小＝＝＝
if (int_Standard_Height * int_Width / int_Standard_Width > int_Height) {
Reduce_Width = int_Width;
Reduce_Height = int_Standard_Height * int_Width / int_Standard_Width;
CutOut_Width = int_Width;
CutOut_Height = int_Height;
} else if (int_Standard_Height * int_Width / int_Standard_Width < int_Height) {
Reduce_Width = int_Standard_Width * int_Height / int_Standard_Height;
Reduce_Height = int_Height;
CutOut_Width = int_Width;
CutOut_Height = int_Height;
} else {
Reduce_Width = int_Width;
Reduce_Height = int_Height;
CutOut_Width = int_Width;
CutOut_Height = int_Height;
}
// ＝＝＝通过连接创建Image对象＝＝＝
System.Drawing.Image oldimage = System.Drawing.Image.FromFile(Server.MapPath(input_ImgUrl));
// ＝＝＝缩小图片＝＝＝
System.Drawing.Image thumbnailImage = oldimage.GetThumbnailImage(Reduce_Width, Reduce_Height, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
Bitmap bm = new Bitmap(thumbnailImage);
// ＝＝＝处理JPG质量的函数＝＝＝
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo ici = null;
foreach (ImageCodecInfo codec in codecs) {
if (codec.MimeType == "image/jpeg")
ici = codec;
}
EncoderParameters ep = new EncoderParameters();
ep.Param[0] = new EncoderParameter(Encoder.Quality, (long)level);
//bm.Save(Server.MapPath("2.jpg"), ici, ep);
// ＝＝＝裁剪图片＝＝＝
Rectangle cloneRect = new Rectangle(0, 0, CutOut_Width, CutOut_Height);
PixelFormat format = bm.PixelFormat;
Bitmap cloneBitmap = bm.Clone(cloneRect, format);
// ＝＝＝保存图片＝＝＝
cloneBitmap.Save(Server.MapPath(out_ImgUrl), ici, ep);
}