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127#
# get user's wish of document name
#
if [[ $# -ge 2 ]]; then
pdf_filename=$2
else
pdf_filename=scan
fi
#
# wait for user to place the document stack
#
read -p "PLEASE PUT PAGES WITH CONTENT FACING UP INTO THE FEEDER" -n1
#
# scan front pages in forward sequence
#
# unfortunately, when using ADF, the current implementation of SCANADF
# mismatches the PNM output in the way that subsequent tools like imagemagick
# cannot identify the necessaty file format. this seems to be the case when
# scanning with a y range of about 295 mm when more than 1 page is scanned.
# when scanning at a slightly lower y range, this effect is not visible anymore.
# so, instead of using the full range of 210x295 mm for a DIN A4 page, here,
# a reduced range of 210x291 mm is used.
scanadf --source=ADF --mode=Lineart --resolution=200 --brightness=100 --contrast=300 -x 210 -y 291 -o /home/pi/scan_%02d.pnm
#
# convert all scanned pages to PNG and rename files
#
let filecount=1
let maxfilecount=0
filenames=`ls ./*.pnm`
for f in $filenames; do
# create basename
filename=${f##*/}
basename=${filename%%.*}
echo "$f -> scan_$(printf %02d $filecount).png"
# convert image and remove original file
convert $f scan_$(printf %02d $filecount).png
rm $f
# counters
let maxfilecount=$maxfilecount+1
let filecount=$filecount+2
done
#
# wait for user to place the document stack
#
read -p "PLEASE PUT PAGES WITH CONTENT TOP FACING DOWN INTO THE FEEDER" -n1
#
# scan back pages in forward sequence
#
# unfortunately, when using ADF, the current implementation of SCANADF
# mismatches the PNM output in the way that subsequent tools like imagemagick
# cannot identify the necessaty file format. this seems to be the case when
# scanning with a y range of about 295 mm when more than 1 page is scanned.
# when scanning at a slightly lower y range, this effect is not visible anymore.
# so, instead of using the full range of 210x295 mm for a DIN A4 page, here,
# a reduced range of 210x291 mm is used.
scanadf --source=ADF --mode=Lineart --resolution=200 --brightness=100 --contrast=300 -x 210 -y 291 -o /home/pi/scan_%02d.pnm
#
# convert all scanned pages to PNG and rename files
#
let filecount=$maxfilecount*2
filenames=`ls ./*.pnm`
for f in $filenames; do
# create basename
filename=${f##*/}
basename=${filename%%.*}
echo "$f -> scan_$(printf %02d $filecount).png"
# convert image and remove original file
convert $f scan_$(printf %02d $filecount).png
rm $f
# counters
let filecount=$filecount-2
done
#
# convert to PDF
#
convert scan_*.png $pdf_filename.pdf
rm scan_*.png
# move into nextcloud
mv $pdf_filename.pdf ~/NEXTCLOUD/_scan/