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      • PDF/A Document Archiving Primer
        • Challenges and Complexity of Document Archiving
        • Converting Documents to a Standard Electronic Format
        • PDF Evolves into the Electronic Document Standard
        • PDF as a Records Management Document Solution
        • PDF/A: Document Solution for Archiving and RM
      • Advanced Document Compression Primer
        • Reduced Storage Costs
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        • PdfCompressor’s Adjustable Settings
        • PdfCompressor - Complementing Document Management Workflow
      • OCR Software Primer
        • Thresholding within OCR
        • Texture Patterns and Small Fonts OCR
        • OCR, Neural Networks and other Machine learning Techniques
        • OCR, Crytorithms, Cryptograms and Substitution Ciphers
        • CAPTCHA: Human and Machine Readability & OCR
        • OCR & Novel Fonts, Multidirectional and Undersampled Text
        • Relationship between OCR & JBIG2
        • OCR, MRC & JPEG2000
        • Reverse Video & OCR
        • OCR & How they relate to MFPs (MultiFunctional Peripheral devices)
        • Dictionary Lookup and OCR
        • Rating an OCR System
        • Tweaking the System to Optimize OCR Performance
        • Searchable PDF using OCR
        • Electronic File Conversion & OCR
        • Bar Codes, OCR & ICR
        • OCR & Form Recognition
        • Data Extraction with OCR
        • Business Process Automation and How it Relates to OCR
        • OCR-based ROI
        • Towards the Paperless Office
      • JBIG2 Compression Primer
        • The Business Case for JBIG2 Compression
        • JBIG2 Compression Success Stories
        • JBIG2: A short history
        • Digital file formats: The short definition of JBIG2
        • JBIG2 and TIFF compared
        • JBIG2 and JBIG Comparison
        • Essential compression issues
        • Smart Compression Codecs: JBIG2, JPEG2000, and MPEG4
        • JBIG2: The Compression Connection
        • The JBIG2 Standard
        • Lossless, Lossy, and Perceptually Lossless Compression
        • JBIG2 Technical Advantages for Business Solutions
        • JBIG2 Technical Advantages: File Size
        • Efficient Encoding
        • OCR Support within PDF Format
        • PDF Web Optimization
        • Scanner Distortions Resolved
        • JBIG2-Compressed PDF Documents
        • Pattern Matching & Substitution
        • The Dangers of PM&S: Proceed with Caution
        • Verification
        • Halftoning in JBIG2
        • Utilizing a JBIG2 Encoder with No Information Loss
        • Overview: Benefits of PDF Compression and PDF Conversion
        • JBIG2 Compression Summary
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      • CVISION Releases PdfCompressor 6.5
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      • File Compression and Dept. of Homeland Security
      • Legal Industry Enjoys Freedom from Paper
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      • Improved Efficiency for the Legal Industry
      • New York City based law firm accelerates document efficiency with OCR
      • Leading hospital optimizes documents with compression and OCR
      • Global financial company utilizes digital mailroom
      • Energy Consulting and Construction Company Improves Document Accessibility
      • Manufacturing Company Reduces Accounts Payable Costs with Advanced Solution
      • Frontier Farm Credit Optimizes Accessibility with Distributed Capture Solution
      • Technology Company Reduces Storage Costs
      • CVISION Provides American Radio History a PDF Optimization Solution
      • Top 5 Global Financial Firm Processes 1.25 Billion Pages Yearly with PdfCompressor
      • Global Law Firm Resolves Bottleneck of Scanning and OCR with CVISION
      • Leading Distribution Company Realizes ROI Within 6 Months
      • Non-Profit Leverages Compression for Document Workflow
      • Large Government Agency Uses Compression to Accelerate File Transmission and Retrieval
      • Global Credit Card Company Accelerates Merchant Statement Processing Speed
      • Global Power Industry Leader Increases Document Handling Efficiency by More Than 50% with PdfCompressor
      • Argus der Presse Case Study
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PDF Download OCR Try OCR Online

The PDF Era

PDF or Portable Document Format is the de facto standard in digital publishing and archival. The format evolved from PostScript, and hence continues using most of its features. A PDF document is stored in 2-D using technology and techniques that make it portable with respect to hardware, software and operating systems. This is a key factor for global acceptance of PDF files as a standard for desktop publishing. The PDF file format has entered the public domain as an open standard since 2008. This allows developers to create their own PDF reading and writing software with their own implementation of features. This is achieved using SDKs or Standard Development Kits available for integrating the functionality of PDF file format within existing software.

OCR Files

PDF Technologies and Techniques

The PDF file format primarily comprises of a subset of the PostScript programming language in order to generate graphics and layout. It also has a system of embedding and replacing fonts within the PDF file itself. Another technology used in PDF file format is a structured storage system for all the matter that needs to be embedded within the PDF file, including the functionality to compress the components of the PDF. The images within a PDF can either be in the raster or vector format. A vector image is composed of 2-D paths as their minimum modifiable part, whereas raster images can be modified pixel-by-pixel. It is better to embed vector images in PDFs to decrease their size.

PDF Security

The other important features provided within PDF files are security and form filling. Form filling allows forms within PDF files to be filled interactively by the user. The concerns about security of such an embedded functionality are countered by the complex security mechanisms in PDFs. PDFs allow the file to be encrypted using 40- and 128-bit RC4 and MD5 algorithms. Third party encryption algorithms can also be defined in a PDF. Digital Rights Management can be implemented by limiting the copying, editing or printing of PDF files. However, this can be overcome using OCR conversion. Finally, servers can place a time restriction on offline PDF viewing.

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