C# 如何将XPS文件转换为高质量(而不是模糊的低分辨率)的图像?
我正在尝试使用WPF转换XPS 我们的想法是可以使用silverlight 4加载这些图像,为此,我使用以下代码:C# 如何将XPS文件转换为高质量(而不是模糊的低分辨率)的图像?,c#,wpf,silverlight,xps,rendertargetbitmap,C#,Wpf,Silverlight,Xps,Rendertargetbitmap,我正在尝试使用WPF转换XPS 我们的想法是可以使用silverlight 4加载这些图像,为此,我使用以下代码: // XPS Document XpsDocument xpsDoc = new XpsDocument(xpsFileName, System.IO.FileAccess.Read); FixedDocumentSequence docSeq = xpsDoc.GetFixedDocumentSequence();
// XPS Document
XpsDocument xpsDoc = new XpsDocument(xpsFileName, System.IO.FileAccess.Read);
FixedDocumentSequence docSeq = xpsDoc.GetFixedDocumentSequence();
// The number of pages
PageCount = docSeq.References[0].GetDocument(false).Pages.Count;
DocumentPage sizePage = docSeq.DocumentPaginator.GetPage(0);
PageHeight = sizePage.Size.Height;
PageWidth = sizePage.Size.Width;
// Scale dimensions from 96 dpi to 600 dpi.
double scale = 300/ 96;
// Convert a XPS page to a PNG file
for (int pageNum = 0; pageNum < PageCount; pageNum++)
{
DocumentPage docPage = docSeq.DocumentPaginator.GetPage(pageNum);
BitmapImage bitmap = new BitmapImage();
RenderTargetBitmap renderTarget =
new RenderTargetBitmap((int)(scale * (docPage.Size.Height + 1)),
(int)(scale * (docPage.Size.Height + 1)),
scale * 96,
scale * 96, PixelFormats.Pbgra32);
renderTarget.Render(docPage.Visual);
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderTarget));
FileStream pageOutStream = new FileStream(name + ".Page" + pageNum + ".png", FileMode.Create, FileAccess.Write);
encoder.Save(pageOutStream);
pageOutStream.Close();
//XPS文档
XpsDocument xpsDoc=新的XpsDocument(xpsFileName,System.IO.FileAccess.Read);
FixedDocumentSequence docSeq=xpsDoc.GetFixedDocumentSequence();
//页数
PageCount=docSeq.References[0]。GetDocument(false)。Pages.Count;
DocumentPage sizePage=docSeq.DocumentPaginator.GetPage(0);
PageHeight=sizePage.Size.Height;
PageWidth=sizePage.Size.Width;
//将尺寸从96 dpi缩放到600 dpi。
双刻度=300/96;
//将XPS页面转换为PNG文件
对于(int pageNum=0;pageNum
此代码取自转换XPS文档的项目。
很好!
但问题是图像分辨率低且模糊。
我研究并发现RenderTargetBitmap,并在此页面上找到:
这里的问题是您没有使用硬件渲染器目标位图渲染。
一种解决方案是将DirectX与WPF结合使用来实现这一点,但还没有找到任何清晰的示例来向我展示正确的方法
谢谢你的建议,谢谢
更新:我附加了XPS文档,我正在尝试转换图像
sourceforge.net上有一个名为xps2img的项目,该项目将xps转换为图像。它是用C#制作的,还包含源代码。请查看。它将帮助您实现所需的功能
我在这篇文章和其他许多文章中看到,人们在将DocumentPage转换为图像并将其保存在HDD上时遇到问题。 此方法从document viewer获取所有页面,并将它们作为jpg图像保存在HDD上
public void SaveDocumentPagesToImages(IDocumentPaginatorSource document, string dirPath)
{
if (string.IsNullOrEmpty(dirPath)) return;
if (dirPath[dirPath.Length - 1] != '\\')
dirPath += "\\";
if (!Directory.Exists(dirPath)) return;
MemoryStream[] streams = null;
try
{
int pageCount = document.DocumentPaginator.PageCount;
DocumentPage[] pages = new DocumentPage[pageCount];
for (int i = 0; i < pageCount; i++)
pages[i] = document.DocumentPaginator.GetPage(i);
streams = new MemoryStream[pages.Count()];
for (int i = 0; i < pages.Count(); i++)
{
DocumentPage source = pages[i];
streams[i] = new MemoryStream();
RenderTargetBitmap renderTarget =
new RenderTargetBitmap((int)source.Size.Width,
(int)source.Size.Height,
96, // WPF (Avalon) units are 96dpi based
96,
System.Windows.Media.PixelFormats.Default);
renderTarget.Render(source.Visual);
JpegBitmapEncoder encoder = new JpegBitmapEncoder(); // Choose type here ie: JpegBitmapEncoder, etc
encoder.QualityLevel = 100;
encoder.Frames.Add(BitmapFrame.Create(renderTarget));
encoder.Save(streams[i]);
FileStream file = new FileStream(dirPath + "Page_" + (i+1) + ".jpg", FileMode.CreateNew);
file.Write(streams[i].GetBuffer(), 0, (int)streams[i].Length);
file.Close();
streams[i].Position = 0;
}
}
catch (Exception e1)
{
throw e1;
}
finally
{
if (streams != null)
{
foreach (MemoryStream stream in streams)
{
stream.Close();
stream.Dispose();
}
}
}
}
public void SaveDocumentPagesToImages(IDocumentPaginatorSource文档,字符串dirPath)
{
if(string.IsNullOrEmpty(dirPath))返回;
if(dirPath[dirPath.Length-1]!='\\')
dirPath+=“\\”;
如果(!Directory.Exists(dirPath))返回;
MemoryStream[]streams=null;
尝试
{
int pageCount=document.DocumentPaginator.pageCount;
DocumentPage[]pages=新文档页面[pageCount];
for(int i=0;i
基于xps2img的nuget软件包现已推出:
Api可在此处获得:
私有IList GetTifPagesFromXps(字符串xXpsFileName,双xQuality)
{
使用(var xpsDoc=newxpsdocument(xXpsFileName,FileAccess.Read))
{
var docSeq=xpsDoc.GetFixedDocumentSequence();
var tifPages=新列表();
对于(变量i=0;i private IList<byte[]> GetTifPagesFromXps(string xXpsFileName, double xQuality)
{
using (var xpsDoc = new XpsDocument(xXpsFileName, FileAccess.Read))
{
var docSeq = xpsDoc.GetFixedDocumentSequence();
var tifPages = new List<byte[]>();
for (var i = 0; i < docSeq.DocumentPaginator.PageCount; i++)
{
using (var docPage = docSeq.DocumentPaginator.GetPage(i))
{
var renderTarget = new RenderTargetBitmap((int)(docPage.Size.Width * xQuality), (int)(docPage.Size.Height * xQuality), 96 * xQuality, 96 * xQuality, PixelFormats.Default);
renderTarget.Render(docPage.Visual);
var jpegEncoder = new JpegBitmapEncoder { QualityLevel = 100 };
jpegEncoder.Frames.Add(BitmapFrame.Create(renderTarget));
byte[] buffer;
using (var memoryStream = new MemoryStream())
{
jpegEncoder.Save(memoryStream);
memoryStream.Seek(0, SeekOrigin.Begin);
buffer = memoryStream.GetBuffer();
}
tifPages.Add(buffer);
}
}
xpsDoc.Close();
return tifPages.ToArray();
}
}