我使用aspose.pdf将pdf转为分辨率为600的JPEG图像，放大后图片内的文字很模糊，请问需要添加什么参数吗？我用aspose提供的在线pdf转换图片网站得到的也是一样的结果。
这是我使用的pdf和经过转换的图片文件，图片分辨率均为600。
files.zip (3.1 MB)
AspWordsWarningCallBack AspCallBack = new AspWordsWarningCallBack();
string FileType = System.IO.Path.GetExtension(DocumentsFileName);
//初始化一个临时参数，到时候重新初始化
Aspose.Words.Saving.ImageSaveOptions TempWordImageSaveOption = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Jpeg);
Aspose.Words.Document TempWordDocument = null;
Aspose.Cells.Workbook TempExcelDocument = null;
Aspose.Cells.Rendering.ImageOrPrintOptions TempExcelImageOPtion = new Aspose.Cells.Rendering.ImageOrPrintOptions();
Aspose.Pdf.Document TempPdfDocument = null;
Aspose.Pdf.Devices.ImageDevice TempPdfImageDevice = null;
Aspose.Pdf.Devices.TiffDevice TempPdfTifDevice = null;
Aspose.Pdf.Devices.Resolution TempPdfImageResolution = new Aspose.Pdf.Devices.Resolution(DpiValue);
Aspose.Imaging.ImageOptions.JpegOptions TempConvertJpegOption = new JpegOptions();
Aspose.Imaging.ImageOptions.PngOptions TempConvertPngOption = new PngOptions();
Aspose.Imaging.ImageOptions.BmpOptions TempConvertBmpOption = new BmpOptions();
//设置加载word文档的时候参数
Aspose.Words.Loading.LoadOptions TempDocuemntLoadOption = new Aspose.Words.Loading.LoadOptions()
{
ConvertMetafilesToPng = false,
MswVersion = Aspose.Words.Settings.MsWordVersion.Word2010,
};
TempDocuemntLoadOption.LanguagePreferences.AddEditingLanguage(Aspose.Words.Loading.EditingLanguage.ChinesePRC);
switch (FileType)
{
case ".doc":
TempWordDocument = new Aspose.Words.Document(DocumentsFileName, TempDocuemntLoadOption);
TempWordDocument.WarningCallback = AspCallBack;
TempWordDocument.CompatibilityOptions.OptimizeFor(Aspose.Words.Settings.MsWordVersion.Word2010);
TempWordDocument.CompatibilityOptions.BalanceSingleByteDoubleByteWidth = true;//区分全角和半角字符
break;
case ".docx":
TempWordDocument = new Aspose.Words.Document(DocumentsFileName, TempDocuemntLoadOption);
TempWordDocument.WarningCallback = AspCallBack;
TempWordDocument.CompatibilityOptions.OptimizeFor(Aspose.Words.Settings.MsWordVersion.Word2010);
TempWordDocument.CompatibilityOptions.BalanceSingleByteDoubleByteWidth = true;//区分全角和半角字符
break;
case ".pdf":
TempPdfDocument = new Aspose.Pdf.Document(DocumentsFileName);
break;
case ".xls":
TempExcelDocument = new Aspose.Cells.Workbook(DocumentsFileName);
break;
case ".xlsx":
TempExcelDocument = new Aspose.Cells.Workbook(DocumentsFileName);
break;
case ".ppt":
_ = new Aspose.Slides.Presentation(DocumentsFileName);
break;
case ".pptx":
_ = new Aspose.Slides.Presentation(DocumentsFileName);
break;
default: break;
}
//根据不同导出类型进行预初始化处理
switch (ConvertImageType)
{
case ".jpg":
TempWordImageSaveOption = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Jpeg)
{
JpegQuality = 100,
PrettyFormat = true,
};
TempPdfImageDevice = new Aspose.Pdf.Devices.JpegDevice(TempPdfImageResolution, 100);
TempExcelImageOPtion.ImageType = Aspose.Cells.Drawing.ImageType.Jpeg;
TempExcelImageOPtion.Quality = 100;
break;
case ".png":
TempWordImageSaveOption = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Png);
TempPdfImageDevice = new Aspose.Pdf.Devices.PngDevice(TempPdfImageResolution);
TempExcelImageOPtion.ImageType = Aspose.Cells.Drawing.ImageType.Png;
break;
case ".bmp":
TempWordImageSaveOption = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Bmp);
TempPdfImageDevice = new Aspose.Pdf.Devices.BmpDevice(TempPdfImageResolution);
TempExcelImageOPtion.ImageType = Aspose.Cells.Drawing.ImageType.Bmp;
break;
case ".tif":
TempWordImageSaveOption = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Tiff);
TempPdfTifDevice = new Aspose.Pdf.Devices.TiffDevice(TempPdfImageResolution);
TempExcelImageOPtion.ImageType = Aspose.Cells.Drawing.ImageType.Tiff;
break;
default: break;
}
//word转图片的设置
TempWordImageSaveOption.UseHighQualityRendering = true;
TempWordImageSaveOption.Resolution = DpiValue;
TempWordImageSaveOption.ColorMode = Aspose.Words.Saving.ColorMode.Normal;
TempWordImageSaveOption.UseAntiAliasing = true;
TempWordImageSaveOption.AllowEmbeddingPostScriptFonts = true;
//pdf转图片设置
TempPdfImageDevice.RenderingOptions.DefaultFontName = "SimSun";
//excel转图片的设置
TempExcelImageOPtion.CheckWorkbookDefaultFont = true;
TempExcelImageOPtion.HorizontalResolution = DpiValue;
TempExcelImageOPtion.VerticalResolution = DpiValue;
TempExcelImageOPtion.PixelFormat = System.Drawing.Imaging.PixelFormat.Format24bppRgb;
TempExcelImageOPtion.CheckWorkbookDefaultFont = true;
TempExcelImageOPtion.DefaultFont = "SimSun";
if (PageExport)
{
if (FileType == ".doc" || FileType == ".docx")
{
//逐页导出WORD图片
for (int pageIndex = 0; pageIndex < TempWordDocument.PageCount; pageIndex++)
{
string MutilPageFileName = SavedImageFileName.Replace(ConvertImageType, $"_第{pageIndex + 1}页{ConvertImageType}");
TempWordImageSaveOption.PageSet = new Aspose.Words.Saving.PageSet(pageIndex);
TempWordDocument.Save(MutilPageFileName, TempWordImageSaveOption);
if (SetGrayMode)
{
string SavedPath = Path.GetDirectoryName(SavedImageFileName);
string BMP_8BitPath = Path.Combine(SavedPath, "8_bmp_image");
Directory.CreateDirectory(BMP_8BitPath);
string ConvertedBmpFileName = BMP_8BitPath + "\\" + Path.GetFileName(MutilPageFileName).Replace(ConvertImageType, ".bmp");
using Bitmap TempBitMap = new Bitmap(MutilPageFileName);
using Bitmap ConvertedBitMap = ConvertTo256Color(TempBitMap);
ConvertedBitMap.Save(ConvertedBmpFileName, ImageFormat.Bmp);
}
}
}
else if (FileType == ".pdf")
{
//逐页导出PDF的图片，tif图片需要单独处理，他不是imagedeivice类型
for (int PdfPageIndex = 0; PdfPageIndex < TempPdfDocument.Pages.Count; PdfPageIndex++)
{
string MutilPageFileName = SavedImageFileName.Replace(ConvertImageType, $"_第{PdfPageIndex + 1}页{ConvertImageType}");
if (ConvertImageType != ".tif")
{
TempPdfImageDevice.Process(TempPdfDocument.Pages[PdfPageIndex + 1], MutilPageFileName);
}
else
{
TempPdfTifDevice.Process(TempPdfDocument, PdfPageIndex + 1, PdfPageIndex + 1, MutilPageFileName);
}
}
}
这是我将pdf转为图片的代码片段，中间有些别的格式转换图片，忽略即可，我使用的是device的方式导出图片。
是的，我传入的值是600。
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