.zsh_functions/henks_scan_postproc

   1 setopt PIPE_FAIL
   2
   3 local resize_by
   4 local img
   5 resize_by="$1"
   6 shift
   7 for img in $*
   8 do
   9         echo "Processing ${img} ..."
  10         # mostly to remove the alpha channel so ocrmypdf can work with it
  11         # does not seem to work all the time, so 'convert' is used as well below
  12         # still nice to optimize
  13         optipng "${img}"
  14         if [ $? -ne 0 ]
  15         then
  16                 echo "optipng failed"
  17                 return
  18         fi
  19         # resize
  20         # and remove alpha channel so ocrmypdf can work with it
  21         # ocrmypdf does the quantization of the png which reduces size drastically
  22         convert -resize $resize_by% -alpha off "$img" - \
  23         | ocrmypdf - "$(basename $img .png).pdf"
  24         if [ $? -ne 0 ]
  25         then
  26                 echo "convert or ocrmypdf failed"
  27                 return
  28         fi
  29 done
  30