[Bug-ocrad] Best dpi

[Leiradella, Andre V Matos Da Cunha]

Dear Sirs,

I'm implementing ocrad as a backend to cups so users inside my network can
install an OCR printer and have pretty much anything being analyzed by
ocrad, receiving the results as an e-mail attachment (I'm already doing
something similar to produce PDF files). I'll use pstopnm to produce the PBM
files and pass them through ocrad to produce a text file from a PS file
generated by an Windows printer driver, which will be sent as the
attachment.

My question is: which is the best resolution to render the pbm images to
maximize the amount of text ocrad recognizes? I'm making tests with 300 dpi,
which give me files 2550x3300 and 600 dpi, which gives me files 5100x6600.
Currently the smaller files are giving me best results, hence my question.

Regards,

André de Leiradella