File1.PostedFile.SaveAs(Server.MapPath(filename)); System.Drawing.Image image,aNewImage;
int width,height,newwidth,newheight;
image=System.Drawing.Image.FromFile(Server.MapPath(filename));
System.Drawing.Image.GetThumbnailImageAbort callb =new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
width=image.Width;
height=image.Height;
newwidth=width/3;newheight=height/3;
aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr());
aNewImage.Save(Server.MapPath(oldpatch+"/small"+currentTime.ToString().Replace(" ","").Replace(":","")+"."+nam));
image.Dispose();
aNewImage.Dispose();
Response.Write("<script>alert(\"添加成功!\");</script>");
int width,height,newwidth,newheight;
image=System.Drawing.Image.FromFile(Server.MapPath(filename));
System.Drawing.Image.GetThumbnailImageAbort callb =new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
width=image.Width;
height=image.Height;
newwidth=width/3;newheight=height/3;
aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr());
aNewImage.Save(Server.MapPath(oldpatch+"/small"+currentTime.ToString().Replace(" ","").Replace(":","")+"."+nam));
image.Dispose();
aNewImage.Dispose();
Response.Write("<script>alert(\"添加成功!\");</script>");
aNewImage.Save(Server.MapPath.......,System.Drawing.Imaging.ImageFormat.Gif)
图片质量太差了
System.Drawing.Imaging.ImageFormat.Jpg
图片体积又太大
没有折中的方法吗?????????
{
string originalFilename =sourcepath;
//生成的高质量图片名称
string strGoodFile =aimpath; //从文件取得图片对象
System.Drawing.Image image = System.Drawing.Image.FromFile(originalFilename);
int iImgWidth = image.Width;
int iImgHeight = image.Height;
int iScale = (iImgWidth / scale)>(iImgHeight/scale) ? (iImgWidth / scale) : (iImgHeight / scale); //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);
g.Dispose();
}