This section provides information about the following:
Loading a Password Protected PDF
To load a password protected PDF refer to Use PDF Security.
Saving as a PDF
ImageGear .NET PDF component provides the ImGearPDFSaveOptions class that defines options for saving raster pages and documents to specific PDF formats like PDF/A. This class is derived from the regular ImGearSaveOptions class and could be used with the regular ImGearFileFormats.SavePage and ImGearFileFormats.SaveDocument methods that take ImGearSaveOptions parameter.
The following sample code demonstrates how to use the ImGearPDFSaveOptions class for saving raster document to PDF/A:
| C# |
Copy Code |
ImGearDocument doc = null;
// Load raster document.
using (FileStream fileStream = new FileStream(infile, FileMode.Open, FileAccess.Read, FileShare.Read))
{
doc = ImGearFileFormats.LoadDocument(fileStream, 0, -1);
}
// Specify PDF/A options for saving.
ImGearPDFSaveOptions pdfOptions = new ImGearPDFSaveOptions();
pdfOptions.PreflightOptions = new ImGearPDFPreflightConvertOptions(ImGearPDFPreflightProfile.PDFA_1A_2005, 0, -1);
pdfOptions.PreflightOptions.OutputIntentColorProfile = ImGearColorProfileManager.RgbProfile;
// Save to PDF/A file.
using (FileStream fileStream = new FileStream(outfile, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
ImGearFileFormats.SaveDocument(doc, fileStream, 0, ImGearSavingModes.OVERWRITE, ImGearSavingFormats.PDF_DEFLATE, pdfOptions);
} |
| VB.NET |
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Dim doc As ImGearDocument
' Load raster document.
Using fileStream As FileStream = New FileStream(infile, FileMode.Open, FileAccess.Read, FileShare.Read)
doc = ImGearFileFormats.LoadDocument(fileStream, 0, -1)
End Using
' Specify PDF/A options for saving.
Dim pdfOptions As ImGearPDFSaveOptions = New ImGearPDFSaveOptions()
pdfOptions.PreflightOptions = New ImGearPDFPreflightConvertOptions(ImGearPDFPreflightProfile.PDFA_1A_2005, 0, -1)
pdfOptions.PreflightOptions.OutputIntentColorProfile = ImGearColorProfileManager.RgbProfile
' Save to PDF/A file.
Using fileStream As FileStream = New FileStream(outfile, FileMode.OpenOrCreate, FileAccess.ReadWrite)
ImGearFileFormats.SaveDocument(doc, fileStream, 0, ImGearSavingModes.OVERWRITE, ImGearSavingFormats.PDF_DEFLATE, pdfOptions)
End Using |
You can also use this approach for converting PDF files to PDF/A which would be effectively the same as using
ImGearPDFPreflight.Convert for the original PDF document.
Reducing File Size when Saving a PDF
In order to reduce the size of a PDF document, use the ImageGear PDF Filter Control Parameters "SaveFlags". For this purpose, combine the following ImGearPDFSaveFlags:
- ImGearPDFSaveFlags.ADD_FLATE
- ImGearPDFSaveFlags.REPLACE_LZW
- ImGearPDFSaveFlags.REMOVE_ASCII_FILTERS
- ImGearPDFSaveFlags.COMPRESSED
- ImGearPDFSaveFlags.OPTIMIZE_XOBJECTS
- ImGearPDFSaveFlags.OPTIMIZE_CONTENT_STREAMS
- ImGearPDFSaveFlags.OPTIMIZE_FONTS
| C# |
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ImGearPDFSaveFlags saveFlags = ImGearPDFSaveFlags.ADD_FLATE | ImGearPDFSaveFlags.REPLACE_LZW | ImGearPDFSaveFlags.REMOVE_ASCII_FILTERS | ImGearPDFSaveFlags.COMPRESSED | ImGearPDFSaveFlags.OPTIMIZE_XOBJECTS | ImGearPDFSaveFlags.OPTIMIZE_CONTENT_STREAMS | ImGearPDFSaveFlags.OPTIMIZE_FONTS;
ImGearControlParameter parameter = ImGearFileFormats.Filters.Get(ImGearFormats.PDF).Parameters.GetByName("SaveFlags");
parameter.Value = saveFlags; |
| VB.NET |
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Dim saveFlags As ImGearPDFSaveFlags = ImGearPDFSaveFlags.ADD_FLATE Or ImGearPDFSaveFlags.REPLACE_LZW Or ImGearPDFSaveFlags.REMOVE_ASCII_FILTERS Or ImGearPDFSaveFlags.COMPRESSED Or ImGearPDFSaveFlags.OPTIMIZE_XOBJECTS Or ImGearPDFSaveFlags.OPTIMIZE_CONTENT_STREAMS Or ImGearPDFSaveFlags.OPTIMIZE_FONTS
Dim parameter As ImGearControlParameter = ImGearFileFormats.Filters.[Get](ImGearFormats.PDF).Parameters.GetByName("SaveFlags")
parameter.Value = saveFlags |
When the
Save Compressed PDF functionality provided in ImageGear is used, you do not need to explicitly set these Save Flags. In this case, the saving operation is executed with these flags activated in order to obtain higher compression rates.
Saving a Password Protected PDF
To save a password protected PDF refer to Use PDF Security.
Exporting OCR Recognized Data to a PDF Output
See Export to a PDF Document for more information.
Saving a PDF as Other Supported Formats
See Convert... for more information.
