Comment 22 for bug 891586

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Michael Nagel (nailor) wrote : Re: Resolution control not working

from grepping through the sources i am quite confident that simple-scan uses "--resolution" exclusively and ignores "--x-resolution" and "--y-resolution"

so if above commands work, we have the explanation.

ps: possibly you need:

--resolution-bind=no as in

scanimage --resolution-bind=no --x-resolution 600 --y-resolution 600 > si-600-600.pnm
scanimage --resolution-bind=no --x-resolution 600 > si-600--.pnm
scanimage --resolution-bind=no --y-resolution 600 > si---600.pnm