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#!/bin/bash
#
# USAGE:
# ./color_convert.sh colormodelayer1,colormodelayer2 input_layer1.pdf,input_layer2.pdf output.pdf
# spot colour colormode should look like "spot-COLOR NAME-0 0.64 0.67 0.02"
# where COLOR NAME is the name of the colour and 0 0.64 0.67 0.02 are cmyk values from 0 to 1
DEBUG=0
DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
function graytospot {
[ $DEBUG -eq 1 ] && echo "converting : $1 to $2 \n"
####################################################################
#part1: let's put our custom color reference in gray_to_spot.ps
IFS='-' read -a args <<< "$2"
IFS=' ' read -a color <<< "${args[2]}"
unset IFS
#args[1] = color name, args[2] = cmyk equivalent in 1 line
#color[0] = C, color[1] = M, color[2] = Y, color[3] = K
spotcolor="\/spotcolor [\/Separation (${args[1]}) \/DeviceCMYK{dup ${color[0]} mul exch dup ${color[1]} mul exch dup ${color[2]} mul exch ${color[3]} mul}] def"
[ $DEBUG -eq 1 ] && echo "spotcolor : $spotcolor \n"
sed -i "s/^\/spotcolor.*$/$spotcolor/g" $DIR/gray_to_spot.ps
#endpart1
######################################################################
#part2: convert to ps file using pdftops
pdftops "$1"
psfile="${1/.pdf/.ps}"
######################################################################
#part3: modify bitmap decode from [0 1] to [1 0] in generated ps
sed -i -e 's/Decode \[0 1\]/Decode [1 0]/g' "$psfile"
######################################################################
#part4: convert back to pdf using gray_to_spot.ps
gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dEncodeColorImages=false -sOutputFile="$1" $DIR/gray_to_spot.ps "$psfile"
######################################################################
#part5: remove ps file
[ $DEBUG -eq 0 ] && rm "$psfile"
}
IFS=',' read -a layers <<< "$1"
IFS=',' read -a input_files <<< "$2"
unset IFS
if [ $DEBUG -eq 1 ]; then echo "layers : "; printf '%s' "${layers[@]}"; fi
if [ $DEBUG -eq 1 ]; then echo "files : "; printf '%s' "${input_files[@]}"; fi
#loop on files and convert them according to layers colormodes
for index in "${!layers[@]}"
do
echo "${input_files[index]} ${layers[index]}"
if [ "${layers[index]}" = "black" ] || [[ "${layers[index]}" == spot* ]]; then
gs \
-dNOPAUSE \
-dBATCH \
-sDEVICE=pdfwrite \
-sProcessColorModel=DeviceGray \
-sColorConversionStrategy=Gray \
-sDefaultCMYKProfile=ps_cmyk.icc \
-dOverrideICC \
-dEncodeColorImages=false \
-sOutputFile="${input_files[index]/.pdf/-tmp.pdf}" "${input_files[index]}"
if [[ "${layers[index]}" == spot* ]]; then
graytospot "${input_files[index]/.pdf/-tmp.pdf}" "${layers[index]}"
fi
elif [ "${layers[index]}" = "cmyk" ]; then
gs \
-dNOPAUSE \
-dBATCH \
-sDEVICE=pdfwrite \
-dProcessColorModel=/DeviceCMYK \
-sColorConversionStrategy=CMYK \
-sDefaultCMYKProfile=ps_cmyk.icc \
-dOverrideICC \
-dEncodeColorImages=false \
-sOutputFile="${input_files[index]/.pdf/-tmp.pdf}" "${input_files[index]}"
fi
if [ $DEBUG -eq 0 ]; then
rm "${input_files[index]}"
fi
done
####IF SINGLE LAYER
if [ ${#layers[@]} = 1 ]; then
mv "${input_files[0]/.pdf/-tmp.pdf}" "$3"
exit
fi
####ELSE OVERLAY
inputFile="${input_files[0]/.pdf/-tmp.pdf}"
for(( i=1; i < ${#layers[@]}; i++ ))
do
pdftk "$inputFile" multistamp "${input_files[i]/.pdf/-tmp.pdf}" output "${3/.pdf/$i.pdf}"
if [ $DEBUG -eq 0 ]; then
rm "$inputFile"
rm "${input_files[i]/.pdf/-tmp.pdf}"
fi
inputFile="${3/.pdf/$i.pdf}"
done
lastFileN=$(expr ${#layers[@]} - 1)
mv "${3/.pdf/$lastFileN.pdf}" "$3"
echo "done"
exit