string originalFilename
=Server.MapPath("222.jpg");
//生成的高质量图片名称
string strGoodFile = Server.MapPath("222-small-good.jpg");
//生成的低质量图片名称
string strBadFile = Server.MapPath("222-small-bad.jpg");
//缩小的倍数
int iScale = 3;
//从文件取得图片对象
System.Drawing.Image image =
System.Drawing.Image.FromFile(originalFilename);
//取得图片大小
System.Drawing.Size size = new Size(image.Width / iScale,
image.Height / iScale);
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(size.Width,
size.Height);
//新建一个画板
System.Drawing.Graphics g =
System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode =
System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode =
System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空一下画布
g.Clear(Color.Blue);
//在指定位置画图
g.DrawImage(image, new System.Drawing.Rectangle(0, 0, bitmap.Width,
bitmap.Height),
new System.Drawing.Rectangle(0, 0, image.Width,
image.Height),
System.Drawing.GraphicsUnit.Pixel);
//保存高清晰度的缩略图
bitmap.Save(strGoodFile,
System.Drawing.Imaging.ImageFormat.Jpeg);
//取得原图像的普通缩略图
System.Drawing.Image img = image.GetThumbnailImage(image.Width /
iScale, image.Height / iScale, null, IntPtr.Zero);
//保存普通缩略图
img.Save(strBadFile, System.Drawing.Imaging.ImageFormat.Jpeg);
g.Dispose();
image.Dispose();
Response.Write("<script>alert('生成完毕')</script>");