The Portable Document Format (PDF) was developed by the Adobe Corporation to allow the exchange and viewing of electronic documents easily and reliably, independent of the environment in which they were created. This format lets you compress large documents to a size small enough to download very quickly. It is also becoming a powerful format for reproducing documents over the web.
The PDF Filter can:
The following table summarizes the filter's capabilities:
|PDF Version||Read||Write Flags|
By default, the filter saves to PDF v1.2. To save the PDF file as a specific PDF version, set the value of the Version property to:
In LEADTOOLS version 16 and later, the PDF Filter supports saving PDF/A format. PDF/A does not support all compression formats (see https://www.pdfa.org/pdfa-faq/ for more details). Therefore you cannot use this flag in conjunction with RasterImageFormat.RasPdfLzw.
This filter can load JBIG2 compressed PDF files. It can both load and save PDF files that are JPEG CCITT, CCITT G3 2D, or CCITT G4 compressed, or are uncompressed. In addition, this filter supports saving JBIG2 and JPEG2000 compressed data. (Note that JBIG2 is only available for PDF 1. 4 or later and JPEG2000 is only available for PDF 1.5 or later.)
IThis filter supports an option that disables the cropping of files, by setting the DisableCropping property, and an option that disables the use of CIE colors, by setting the DisableCieColors property. Disabling the use of CIE colors will result in faster loading of PS files.
The file constants associated with this file format are:
|Constant||Read Support||Write Support||Description|
|RasPdf||Yes||1, 2, 4, 8, 24 BPP||Raster PDF uncompressed.|
|RasPdfCmyk||N/A||24 BPP||Raster PDF with CMYK support.|
|RasPdfG31Dim||N/A||1 BPP||Raster PDF with G3 1D Compression.|
|RasPdfG32Dim||N/A||1 BPP||Raster PDF with G3 2D Compression.|
|RasPdfG4||N/A||1 BPP||Raster PDF with G4 Compression.|
|RasPdfLzw||N/A||1, 2, 4, 8, 24 BPP||Raster PDF with LZW Compression.|
|RasPdfLzwCmyk||N/A||24 BPP||Raster PDF with CMYK support and LZW Compression.|
|RasPdfJpeg||N/A||8 BPP (Grayscale) 24 BPP||Raster PDF with JPEG 4:4:4 Compression.|
|RasPdfJpeg422||N/A||24 BPP||Raster PDF with JPEG 4:2:2 Compression.|
|RasPdfJpeg411||N/A||24 BPP||Raster PDF with JPEG 4:1:1 Compression.|
|RasPdfJbig2||N/A||1 BPP||Raster PDF with JBIG2 Compression.|
|RasPdfJpx||N/A||24 BPP||Raster PDF with Jpx Compression.|
*NOTE: When you request file information on a PDF file, RasPdf will always be returned for the file format, regardless of the composition of the PDF file. LEADTOOLS can read PDF documents that are made up of both text and images. The text and images are rasterized into one raster image for each page of the document. LEADTOOLS can write PDF documents that are made up of raster images only.
Required DLL: Leadtools.Pdf.dll, Leadtools.ColorConversion.dll and Leadtools.Codecs.Fax.dll. The files required for reading PDF and writing PDF are different. For a listing of the exact DLLs needed, based on the toolkit version, refer to Files To Be Included With Your Application .
Platforms: .NET 4, .NET Standard, Android, iOS/macOS.
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