What are OCR PDF Files
There are various ways to create PDF documents. Word documents or spreadsheets can be read and interpreted by a PDF writer because they already contain electronic character designations. This produces a reliable output. PDF documents are also created by scanning documents into the electronic format. Scanned documents are mere images where even text represents an image. To convert these images into an editable format once again OCR or Optical Character Recognition software is required. The software analyses the image of every character and converts it back into text. The output depends on the quality of the image and the number of fonts used in a document. Documents with underlined, strike throughs, and fonts in italics will affect the output.
How Does a PDF OCR Converter Work
When documents are scanned a `snap-shot' of the image is created. A PDF document is then created by the scanning software, resulting in a scanned PDF document. There are a number of OCR to PDF software available. An OCR to PDF convertor is a tool to convert image files like TIFF, BMP, JPEG into a searchable PDF format. It electronically identifies each character and converts it into an editable format. It extracts text from the image by the process of Optical Character Recognition. Some websites offer free trials and downloads of their products. Most of them support clear and skew-correct B/W images for better quality PDFs. Some don't require a download or you can download free trial versions. Scan-to-PDF technology has improved over the years with developers striving for perfection in a very demanding market.
Buying a PDF OCR Converter
If you need to compose ebooks a good PDF OCR converter should be able to convert a host of image formats that include TIFF, JPG, GIF, BMP, PCX, PIC etc. It must support all windows systems, and the ability to process files in batches. You should be able to set permissions that will restrict copying, modifying and printing to PDF document. Accuracy and speed at which batch files can be converted is of course of prime importance. These are what you should look at before you purchase one.