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File Formats: Portable Document Format (PDF)

Portable Document Format (PDF). 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.

LEAD supports versions 1.2, 1.3 and 1.4 of this format. LEAD also supports loading and saving multi-page files in this format.

The PDF Filter loads AI (Adobe Illustrator) files from version 7 to version 10, which only have PDF data.

This filter can also save large images by setting the LowMemoryUsage property. In addition, 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.

Note: Not all flavors of JBIG2 decompression are supported.

This filter can load files that are stored in memory (memory files). In addition, it 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.

Support for this format is available in the PDF Plug in.

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

Required DLL: Leadtools.Codecs.Pdf.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.

*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.

Related Formats: PS - PostScript Document Format, RTF - Rich Text Format.