Replaced pdfimages with pdftoppm

Fixes #1 (closed)

batch.sh

@@ -21,6 +21,7 @@ Options:
     -o, --out       output folder containing passwords.csv and moodle_feedbacks.zip. Default: ./out
     -p, --password  sets global password. Default: empty, such that each PDF gets a custom password generated with 'pwgen'
         --cores     number of cores for watermarking. Default: 1
+    -d, --dpi       dpi parameter for conversion from pdf to images. Default: 250
     -q, --quality   quality parameter for jpeg. Default: 25
     -t, --tmp       tmp folder. Default: ./tmp"
 
@@ -32,8 +33,8 @@ if [[ ${PIPESTATUS[0]} -ne 4 ]]; then
     exit 1
 fi
 
-OPTIONS=hi:c:o:p:q:t:v
-LONGOPTS=help,in:,csv:,out:,password:,cores:,quality:,tmp:,verbose
+OPTIONS=hi:c:o:p:d:q:t:v
+LONGOPTS=help,in:,csv:,out:,password:,cores:,dpi:,quality:,tmp:,verbose
 
 # -regarding ! and PIPESTATUS see above
 # -temporarily store output to be able to check for errors
@@ -48,7 +49,7 @@ fi
 # read getopt’s output this way to handle the quoting right:
 eval set -- "$PARSED"
 
-infolder=- csv=- outfolder=- cores=- quality=- tmpfolder=- v=n password=-
+infolder=- csv=- outfolder=- cores=- dpi=- quality=- tmpfolder=- v=n password=-
 # now enjoy the options in order and nicely split until we see --
 while true; do
     case "$1" in
@@ -76,6 +77,10 @@ while true; do
             cores="$2"
             shift 2
             ;;
+        -d|--dpi)
+            dpi="$2"
+            shift 2
+            ;;            
         -q|--quality)
             quality="$2"
             shift 2
@@ -126,6 +131,11 @@ if [[ $cores = "-" ]]; then
   cores=1
 fi
 
+if [[ $dpi = "-" ]]; then
+  # global password not given, use distinct password for each pdf
+  dpi=250
+fi
+
 if [[ $quality = "-" ]]; then
   # global password not given, use distinct password for each pdf
   quality=2