When we are
working with documents that have been created by computer software (or a native
file) and saved to the PDF format, all kinds of information is encoded into them.
Our software can then read this information and extract it into a new document.
Contrarily, when we are working with a scanned file, this file is simply an image - there is no information stored for our program to read. In such a case, we rely on
an OCR engine which stands for Optical character recognition. This system
extracts the data in the file by scanning and recognizing the alpha and numeric
characters in the document. Unfortunately, it us unable to recognize the image
portions and thus these graphics will be dropped from the conversion.
This article refers to Able2Doc Professional and Able2Extract Professional.