pdfsandwich generates "sandwich" OCR PDF files, i.e. PDF files which contain only images (no text) will be processed by optical character recognition (OCR) and the text will be added to each page invisibly "behind" the images. pdfsandwich is a command line tool which is supposed to be useful to OCR scanned books or journals. It is able to recognize the page layout even for multicolumn text.
pdfsandwich generates "sandwich" OCR PDF files, i.e. PDF files which contain only images (no text) will be processed by optical character recognition (OCR) and the text will be added to each page invisibly "behind" the images. pdfsandwich is a command line tool which is supposed to be useful to OCR scanned books or journals. It is able to recognize the page layout even for multicolumn text.
To install pdfsandwich, run the following command in macOS terminal (Applications->Utilities->Terminal)
sudo port install pdfsandwich
To see what files were installed by pdfsandwich, run:
port contents pdfsandwich
To later upgrade pdfsandwich, run:
sudo port selfupdate && sudo port upgrade pdfsandwich
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