debian-gnome/tools/extract_pdf_image

#!/bin/bash


usage(){
	echo "Usage: $(basename "$0") <PAGE|[START]-[END]> <FILE.pdf> [FOLDER|PREFIX]"
}

[[ $# -lt 2 ]] && usage && exit 2

PAGE=$1
PDF=$2
DEST=${3:-.}

[[ ! -f "$PDF" ]] && echo "FAILURE: File <$PDF> not found!" && exit 3
file -bi "$PDF" | grep -q "application/pdf"
[[ $? -ne 0 ]] && echo "FAILURE: File <$PDF> not detected as a valid application/pdf document!" && exit 3

if [[ -d $DEST ]];  then
	DEST="$DEST/extract"
fi

if [[ "$PAGE" == *-* ]]; then
	START=$(echo "$PAGE" | cut -d '-' -f1)
	START=${START:-1}
	PAGINATION="-f $START"
	
	END=$(echo "$PAGE" | cut -d '-' -f2)
	if [[ ! -z $END ]]; then
		PAGINATION="$PAGINATION -l $END"
	fi
else
	PAGINATION="-f $PAGE -l $PAGE"
fi

pdftoppm -jpeg $PAGINATION "$PDF" "$DEST"