[sane-devel] Canon MF4320-4350

[scar]

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scar @ 05/15/2010 12:56 PM:
> we have a ton of text documents that need to be scanned, and lineart is
> the best option.  the ADF works well and i can easily create multi-page
> PDF's with xsane, too.  does anyone know of an easy/batch method to
> convert PNG and PDF files to lineart?

so far, i've found imagemagick.  scan everything to PNG and then i run:

convert -verbose -threshold 50% -quality 100 -type bilevel -adjoin *.png
out.pdf

it worked well, about 45 MB of grayscale images to 2.5 MB PDF file.
but, it's dog slow and takes a ton of memory, for just 30 images it took
about 30 minutes and all kinds of swap memory.. brought my system to
it's knees (it's a six year old laptop though).

it would be nice if there was a way to force the backend to offer
lineart, maybe by making some changes in the source?  i'd like to see if
it's possible.

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