[sane-devel] help with improving text scans

[m. allan noah]

The gimp probably defaults images to something like 72dpi. if you have
scanned at a higher dpi, it wont know, and will print it huge. just
change the print dpi in the gimp to match that at which you scanned.
look in the image->print size menu option

allan

On Fri, Dec 19, 2008 at 11:34 AM, gobo <gobo770 at gmail.com> wrote:
> for some time now i've been using homemade scripts with scanimage and
> scanadf to scan my paper documents. most of my documents are plain
> text. the results have always been poor and marginally acceptable. i'm
> using suse 10.3 and an hp aio j6450 or psc1210xi.
>
> recently i obtained a canon scanner w/adf for use at work where i must
> use windows. to get around the image compatibility issues of microsoft
> document imaging (office 2003) i simply print the scanned image to pdf
> with acrobat. the results obtained with mdi are far superior to
> anything i've ever been able to achieve with sane apps.
>
> i've spent hours fumbling around with scanimage options, imagemagick
> convert to resize the images and ps2pdf to produce the pdf files.
> while i have made some slight improvements over the default settings,
> i've never been able to get even close to the mdi output. in the few
> places where i must have a good scan, i use resolutions of 150 or 300,
> but to get prints of the image becomes a real pain. i must load the
> image in gimp, fiddle around resizing it and then printing.
>
>
> my standard scanimage script would contain:
> scanimage -x 215.9 -y 297 -d
> hpaio:/net/Officejet_J6400_series?ip=192.168.1.103 \
> -pv --mode gray > $FILE
>
>
> pieces from a perl script using the adf:
> # this is the scan device
> @scanr = ("hpaio:/net/Officejet_J6400_series?ip=192.168.1.103");
> # these are the command line options for scanadf
> @opts = ("-x 215.9 -y 297 -v --mode=gray --source ADF --batch-scan=no -e 1");
>
> # scan page
> system("scanadf @opts -d @scanr -o $fnamepg");
>
> adding --resolution=150, or 300 does produce a larger image, with less
> artifacting, and much more readable, but difficult to print.
>
> the answer must be one of two things -- either i'm missing something
> real simple about producing hi-res 8.5x11" images (that is right in
> front of my nose) or we are just not there yet with linux scanning.
>
> can someone correct, or put me on a better path?
>
> thanks.
>
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