In version 0.22-rc1 of Ocrad (to be upload to experimental soon), the
manual page reads as follows:
GNU Ocrad is an OCR (Optical Character Recognition) program based on a
feature extraction method. It reads images in pbm (bitmap), pgm
(greyscale) or ppm (color) formats and produces text in byte (8-bit) or
UTF-8 formats. The pbm, pgm and ppm formats are collectively known as
pnm.
Is this wording satisfactory for you?
--
Jakub Wilk
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