/// <summary>
/// 按大小压缩
/// </summary>
/// <param name="Width">压缩宽</param>
/// <param name="Height">压缩高</param>
/// <param name="targetFilePath">要压缩的图片路径</param>
/// <returns>返回压缩后的图片路径</returns>
public static string ReducedImage(int Width, int Height, string targetFilePath)
{
using (Image ResourceImage = Image.FromFile(targetFilePath))
{
Image ReducedImage;
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(delegate { return(false); });
ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero); //按大小压缩
string newImagePath = targetFilePath.Substring(0, targetFilePath.LastIndexOf("\\") + 1) + Guid.NewGuid().ToString() + ".jpg"; //压缩图片的存储路径
ReducedImage.Save(newImagePath, ImageFormat.Jpeg); //保存压缩图片
ReducedImage.Dispose();
return(newImagePath); //返回压缩图片的存储路径
}
}
protected void ShowThumbnail(string path, int width, int height)
{
CheckPath(path);
FileStream fs = new FileStream(FixPath(path), FileMode.Open);
Bitmap img = new Bitmap(Bitmap.FromStream(fs));
fs.Close();
fs.Dispose();
int cropWidth = img.Width, cropHeight = img.Height;
int cropX = 0, cropY = 0;
double imgRatio = (double)img.Width / (double)img.Height;
if (height == 0)
{
height = Convert.ToInt32(Math.Floor((double)width / imgRatio));
}
if (width > img.Width)
{
width = img.Width;
}
if (height > img.Height)
{
height = img.Height;
}
double cropRatio = (double)width / (double)height;
cropWidth = Convert.ToInt32(Math.Floor((double)img.Height * cropRatio));
cropHeight = Convert.ToInt32(Math.Floor((double)cropWidth / cropRatio));
if (cropWidth > img.Width)
{
cropWidth = img.Width;
cropHeight = Convert.ToInt32(Math.Floor((double)cropWidth / cropRatio));
}
if (cropHeight > img.Height)
{
cropHeight = img.Height;
cropWidth = Convert.ToInt32(Math.Floor((double)cropHeight * cropRatio));
}
if (cropWidth < img.Width)
{
cropX = Convert.ToInt32(Math.Floor((double)(img.Width - cropWidth) / 2));
}
if (cropHeight < img.Height)
{
cropY = Convert.ToInt32(Math.Floor((double)(img.Height - cropHeight) / 2));
}
Rectangle area = new Rectangle(cropX, cropY, cropWidth, cropHeight);
Bitmap cropImg = img.Clone(area, System.Drawing.Imaging.PixelFormat.DontCare);
img.Dispose();
Image.GetThumbnailImageAbort imgCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);
_r.AddHeader("Content-Type", "image/png");
cropImg.GetThumbnailImage(width, height, imgCallback, IntPtr.Zero).Save(_r.OutputStream, ImageFormat.Png);
_r.OutputStream.Close();
cropImg.Dispose();
}