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我正在将所有图像格式更改为.gif格式,但在更改为新格式后会丢失其质量。我使用下面的代码来更改格式。在更改图像格式时丢失图像质量
String paths = HttpContext.Current.Request.PhysicalApplicationPath + "DesktopModules\\DNAiusParallelSlider\\Images\\"+ModuleId.ToString()+"\\";
if (FileUpload2.HasFile)
{
string extension = Path.GetExtension(FileUpload2.PostedFile.FileName);
FileUpload2.SaveAs(paths + "waves" + extension);
System.Drawing.Image image1 = System.Drawing.Image.FromFile(@paths + "\\waves" + extension);
System.Drawing.Image img = System.Drawing.Image.FromFile(@paths + "\\waves" + extension);
if (img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Jpeg))
{
image1.Save(@paths + "\\waves.gif", System.Drawing.Imaging.ImageFormat.Gif);
}
if (img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Bmp))
{
image1.Save(@paths + "\\waves.gif", System.Drawing.Imaging.ImageFormat.Gif);
}
if (img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Png))
{
image1.Save(@paths + "\\waves.gif", System.Drawing.Imaging.ImageFormat.Gif);
}
if (img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Tiff))
{
image1.Save(@paths + "\\waves.gif", System.Drawing.Imaging.ImageFormat.Gif);
}
if (img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Emf))
{
image1.Save(@paths + "\\waves.gif", System.Drawing.Imaging.ImageFormat.Gif);
}
if (img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Wmf))
{
image1.Save(@paths + "\\waves.gif", System.Drawing.Imaging.ImageFormat.Gif);
}
// Save the image in PNG format.
}
可能是因为GIF格式只支持256色。 – Maarten 2012-07-11 11:26:34
另外,请记住,jpeg和(据我所知)wmf和emf格式是有损的,并且在首先将它们保存起来时会失去质量。另外,将jpeg保存为gif是浪费压缩算法潜力的好方法。 – Tharwen 2012-07-11 11:30:45