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#!/bin/bash
###############################################################################
# #
# Martin Bruchanov, bruxy at regnet dot cz #
# #
# http://bruxy.regnet.cz/ #
# #
# Version: 1.2 (Fri Jul 20 13:17:18 CEST 2012) #
# #
###############################################################################
## Defaults
DEFAULT_DPI=300 # default output dpi
GS_DPI=300 # gs will rasterize to this size, before resizing
UNSHARP_RADIUS=1.0 # bitmap enhancing with unsharp mask
COLORS=16777216 # default num. of colors, use 16, 256,...
## Global variables
PAGE_START=1
PAGE_STOP=1
WIDTH=0
HEIGHT=0
PAGE=0
ALL=0
## Help
print_help(){
echo "PDF2PNG"
echo "Usage: " `basename $0` [OPTIONS] FILE
echo
echo "Options:"
echo " -h ... this help"
echo " -a ... convert all pages"
echo " -f N ... from page number N"
echo " -t N ... to page number N"
echo " -p N ... only page N (default N = 1)"
echo " -d N ... resolution in dpi (default N = $DEFAULT_DPI)"
echo " -x N ... bitmap width in pixel (if y not given, save aspect ratio)"
echo " -y N ... bitmap height in pixel (if x not given, save aspect ratio)"
echo " -u N ... unsharp radius (default N = $UNSHARP_RADIUS)"
echo " -c N ... number of colors (default N = $COLORS)"
echo
}
# definition of color escape sequences for ANSI terminal
RED="\033[01;31m"
GREEN="\033[01;32m"
color_echo(){
# 1 -- color escape sequncy
# 2 -- string
# \033[0m -- reset color settings
echo -e "$1 $2 \033[0m"
}
test_return(){
# 1 -- return code $?
# 2 -- description of operation
echo -e -n $2:
COL=40
# move cursor to column $COL
echo -en "\033[${COL}G"
if [ $1 -eq 0 ]
then
color_echo $GREEN OK
else
color_echo $RED FALSE
exit 1
fi
}
if [ $# -lt 1 ] # print help
then
print_help
exit 1
fi
## Process CLI
while getopts "af:t:d:hx:y:w:u:p:c:" name
do
case $name in
a) ALL=1
;;
f) PAGE_START=$OPTARG
;;
t) PAGE_STOP=$OPTARG
;;
p) PAGE=$OPTARG
;;
d) DEFAULT_DPI=$OPTARG
;;
x) WIDTH=$OPTARG
;;
y) HEIGHT=$OPTARG
;;
u) UNSHARP_RADIUS=$OPTARG
;;
c) COLORS=$OPTARG
;;
h) # help
print_help
exit 0
;;
\?)
echo "Invalid option!"
exit 1
;;
esac
done
shift $(($OPTIND - 1));
INPUT=$1
OUTPUT=$(basename $INPUT .pdf)
echo "Input file: $INPUT"
## Check all input parameters and set options
if [ -z "$INPUT" ]
then
echo "No input file!"
exit 1
fi
# All pages processing
MAX_PAGE=`pdfinfo "$INPUT" | grep Pages | awk '{ print $2}'`
if [ -z $MAX_PAGE ]; then exit; fi
if [ $ALL -eq 1 ]
then
PAGE_START=1
PAGE_STOP=$MAX_PAGE
fi
# Page range processing
if [ $PAGE_START -gt 1 ]
then
if [ $PAGE_STOP -eq 1 ]
then
PAGE_STOP=$MAX_PAGE
fi
fi
if [ $PAGE_STOP -gt 1 ]
then
if [ $PAGE_START -eq 1 ]
then
PAGE_START=1
fi
fi
if [ $PAGE -gt 0 ]
then
PAGE_START=$PAGE
PAGE_STOP=$PAGE
fi
# Image size
if [ $WIDTH -gt 0 ]
then
if [ $HEIGHT -gt 0 ]
then
RESIZE=${WIDTH}x${HEIGHT}\!
else
RESIZE=${WIDTH}x
fi
DEFAULT_DPI=0
fi
if [ $HEIGHT -gt 0 ]
then
if [ $WIDTH -gt 0 ]
then
RESIZE=${WIDTH}x${HEIGHT}\!
else
RESIZE=x${HEIGHT}
fi
DEFAULT_DPI=0
fi
if [ $DEFAULT_DPI -gt 0 ]
then
RESIZE=$(((DEFAULT_DPI*100)/GS_DPI))"%"
fi
echo $RESIZE
#exit
##############################################################################
echo "Rasterizing pages from $PAGE_START to $PAGE_STOP."
echo "Output image size: $RESIZE"
j=1
N=$((PAGE_STOP-PAGE_START+1))
for i in `seq $PAGE_START $PAGE_STOP`
do
i=`printf %04u $i`
echo "Processing page no. $i ($j/$N)"
TMP=/tmp/tmp-${i}.png
gs -q -sDEVICE=png16m -dBATCH -dNOPAUSE \
-dFirstPage=$i -dLastPage=$i -r$GS_DPI \
-sOutputFile=$TMP "$INPUT" > /dev/null 2>&1
test_return $? "GhostScript conversion"
convert \
-unsharp "$UNSHARP_RADIUS" \
-resize "${RESIZE}" \
-colors $COLORS +dither \
$TMP png:${OUTPUT}_${i}.png
rm -f $TMP
: $((j++))
done
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