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[英]Keep quality of jpg after converting from pdf to jpg with pdflibnet and c#
[英]How to create image handler from pdf with pdflibnet?
我使用 PDFLIBNET 将 pdf 转换为图像:
public void ConvertPDFtoPNG(string filename, String dirOut)
{
try
{
PDFLibNet.PDFWrapper _pdfDoc = new PDFLibNet.PDFWrapper();
_pdfDoc.LoadPDF(filename);
System.Drawing.Image img = RenderPage(_pdfDoc, 0);
img.Save(Path.Combine(dirOut, Path.GetFileNameWithoutExtension(filename) + ".png"));
_pdfDoc.Dispose();
return;
}
catch
{
File.Copy(System.IO.Path.Combine(Environment.CurrentDirectory, "0.png"), Path.GetFileNameWithoutExtension(filename) + ".png");
}
}
此代码工作正常但我需要在图像处理程序中使用而不保存图像我将此代码更改为使用 MemoryStream 但得到灰色图像:
public string ConvertPDFtoPNG(string filename)
{
PDFLibNet.PDFWrapper _pdfDoc = new PDFLibNet.PDFWrapper();
_pdfDoc.LoadPDF(filename);
System.Drawing.Image img = RenderPage(_pdfDoc, 0);
MemoryStream ms = new MemoryStream();
img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
_pdfDoc.Dispose();
base64String = Convert.ToBase64String(ms.ToArray(), 0, ms.ToArray().Length);
}
请帮我
谢谢
尝试这个:
var b = File.ReadAllBytes(filename);
using (var ms = new MemoryStream(b))
{
var i = Image.FromStream(ms);
i.Save(ms, ImageFormat.Jpeg);
}
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