FineReader Engine can acquire documents and images from different sources:

• Load images from disc or memory
• Scan images via TWAIN
• Load images from digital cameras
• Open PDFs

A list of the different image formats that the latest version of FineReader Engine and FlexiCapture Engine can open and process can be found here

• ABBYY Engines accurately convert all types of PDFs.
  The SDK can access internal PDF information like annotations, meta-data, font dictionaries, and content streams.
• Read More: PDF Opening

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