splitscan

#!/bin/bash
#
# Licensing:
#
# Copyright © Laurence Lumi 2018
# Licensed GNU General Public License v3
# which can be found here https://www.gnu.org/licenses/gpl-3.0.en.html
#

progname=`basename $0`
usage()
	{
	echo >&2 ""
	echo >&2 "$progname:" "$@"
        cat << MESSAGE1
USAGE: $progname [-d] [-dd] [-q] [-h] [-t] [-z] infile [outfile_prefix]
USAGE: $progname [-d] [-dd] [-quarter] [-half] [-three] infile [outfile_prefix]
USAGE: $progname [-help]

OPTIONS:
-z          zip             zip compress the output (the default is not compress the output)

MESSAGE1
exit 1
	}
help()
{
    echo >&2 ""
    echo >&2 "$progname:" "$@"
    cat  >&2 << MESSAGE2

NAME: $progname

PURPOSE: TODO


Arguments:

MESSAGE2
exit 1
}

function DEBUG()
{
 [ ! "$debug" -eq 0 ] &&  $@
}

tmpdir="./"
debug=0
tmpprefix=$tmpdir"_sp_"
comment="Processed with splitscan"
DEBUG echo -set comment "$comment"
prof_dir=$HOME/.scantools
zip="+compress"
mkdir -p "$prof_dir"

while [ $# -gt 0 ]
do
    # get parameters
    case "$1" in
        -help)    # help information note no -h
            echo ""
            help
            ;;
        -d)	debug=1
            ;;
        -dd)	debug=2
            ;;
        -q|-quarter)
            split="quarter"
            ;;
        -h|-half)
            split="half"
            ;;
        -t|-three)
            split="three_quarter"
            ;;
        -z)
            zip="-compress zip"
            ;;
        -)    # STDIN and end of arguments
            break
            ;;
        -*)    # any other - argument
            echo "--- UNKNOWN OPTION ---" $1
            usage
            ;;
        *)     # end of arguments
            break
            ;;
    esac
    shift   # next option
done

infile=$1
outprefix=$2

if [ -z $infile ]; then
    echo "must provide a filename"
    usage
fi
if [ ! -f "$infile" -o ! -r "$infile" ]; then
    echo "Cannot open: $infile"
    exit 1
fi

if [ -z $outprefix ]; then
    outprefix=${infile%".tif"}_
else
    outprefix=${outprefix%".tif"}_
fi
DEBUG echo outprefix: $outprefix

DEBUG set -x
X=`identify -format "%w" $infile`
if [ "$split" = "quarter" ]; then
    DEBUG echo split = $split

    X1=`convert xc: -format "%[fx:  $X *.25]" info:`
    X2=`convert xc: -format "%[fx:  $X *.75]" info:`
elif [ "$split" = "half" ]; then
    DEBUG echo split = $split

    X1=`convert xc: -format "%[fx:  $X *.5]" info:`
    X2=$X1
elif [ "$split" = "three_quarter" ]; then
    DEBUG echo split = $split

    X1=`convert xc: -format "%[fx:  $X *.75]" info:`
    X2=`convert xc: -format "%[fx:  $X *.25]" info:`
else
    echo "nothing to do, you must split by quarter, half or three (quarters)"
    exit 1
fi


Y=`identify -format "%h" $infile`
DEBUG echo X1, X2 and Y: $X1, $X2 and $Y

echo spliting file:"$outprefix"A.tif
convert $infile +repage -crop "$X1"x"$Y"+0+0 +repage $zip "$outprefix"A.tif
echo spliting file:"$outprefix"B.tif
convert $infile +repage -crop "$X2"x"$Y"+"$X1"+0 +repage $zip "$outprefix"B.tif

exit 0