diff --git a/photos2pdf b/photos2pdf
index c51b184..6a63e11 100755
--- a/photos2pdf
+++ b/photos2pdf
@@ -28,8 +28,7 @@ sigmoidal_contrast="45,50%"
 # Number of colors result images are quantized to
 posterize=6
 
-# Keep intermediate images after processing (note that they will be removed in
-# any case at the next run of this script)
+# Keep intermediate images after processing
 keep_tmpfiles=true
 
 # Paper size of all pages
@@ -42,10 +41,13 @@ offset="1cm 3cm"
 scale=0.75
 
 # PDF backdrop template directory
-templatedir=/var/lib/photos2pdf/templates
+templatedir=/var/lib/photos2pdf/template
 
 # Filename of complete result PDF
-result="pdf/result.pdf"
+result_filename="result.pdf"
+
+# Directory of original files to process (initially unset)
+dir=
 
 ##
 # Functions
@@ -71,26 +73,127 @@ info() {
     log INFO "$1"
 }
 
+print_help() {
+    cat << 'EOF'
+photos2pdf
+==========
+
+Description
+-----------
+Trim and brighten JPGs, produce PDF containing one photo per page.
+
+Usage
+-----
+```shell
+photos2pdf [OPTION ...] DIR
+```
+
+Arguments
+---------
+* `DIR`: Directory containing the original photos.
+
+Options
+-------
+* `--simplify INT`:             Before morphology analysis, reduce
+                                image dimensions by this factor
+                                (default: 2).
+* `--morphology STRING`:        Morphology to apply for trimming
+                                (default "Open:6").
+* `--morphology-shape STRING`:  Shape of morphology to apply for
+                                trimming (default: "Disk").
+* `--colors INT`:               Number of colors images are quantized
+                                to for component detection (default: 4).
+* `--connected-components INT`: Neighbors to evaluate when detecting
+                                connected components (default: 8).
+* `--area_treshold INT`:        Area treshold for connected components
+                                detection (default: 1000).
+* `--sigmoidal-contrast-trim STRING`: Sigmoidal contrast adjustment
+                                used when trimming (default: "30,30%").
+* `--sigmoidal-contrast STRING`: Sigmoidal contrast adjustment visible
+                                in result images (default: "45,50%").
+* `--posterize INT`:            Number of colors result images are
+                                quantized to (default: 6).
+* `--keep-tmpfiles true|false`: Keep temporary files (default: false).
+* `--paper STRING`:             PDF page size (default: "a4paper").
+* `--offset STRING`:            Offset in page where image should be
+                                placed (default: "1cm 3cm").
+* `--scale FLOAT`:              Factor to scale image by before placing
+                                in page (default: 0.75).
+* `--templatedir STRING`:       PDF backdrop directory (default:
+                                "/var/lib/photos2pdf/template").
+* `--result-filename STRING`:   Filename of complete result PDF
+                                (default: "result.pdf").
+EOF
+}
+
 ##
 # Arguments
 
-dir=$1
+i=1
+options_done=false
 
-if [[ -z $dir ]] ; then
-    error "Usage: $0 DIR"
-fi
+while [[ $i -le $# ]] ; do
+    arg=$(eval "echo \$$i")
 
-origdir=$(readlink -f "$dir")
+    if ! "$options_done" ; then
+        case "$arg" in
+            -h|--help)
+                print_help
+                exit 0
+            ;;
+            --simplify| \
+            --morphology| \
+            --morphology-shape| \
+            --colors| \
+            --connected-components| \
+            --area-treshold| \
+            --sigmoidal-contrast-trim| \
+            --sigmoidal-contrast| \
+            --posterize| \
+            --keep-tmpfiles| \
+            --paper| \
+            --offset| \
+            --scale| \
+            --templatedir| \
+            --result-filename)
+                var=$(echo "$arg" | sed -e 's|^\-\-||;s|\-|_|g;')
+                i=$((i+1))
+                arg=$(eval "echo \$$i")
+                eval "$var=\"$arg\""
+                i=$((i+1))
+                continue
+            ;;
+            --)
+                options_done=true
+                i=$((i+1))
+                continue
+            ;;
+            -*)
+                error "Unknown option \"$arg\"; aborted."
+            ;;
+        esac
+    fi
 
-if [[ ! -d $origdir ]] ; then
-    error "Directory not found: $dir ($origdir)"
-fi
+    case "$arg" in
+        *)
+            [[ -n $dir ]] && error "Only one input directory can be specified; aborted."
+            dir=$arg
+            i=$((i+1))
+        ;;
+    esac
+done
+
+[[ -z $dir ]] && error "Usage: $0 [OPTION ..] DIR"
 
 ##
 # Main Program
 
 job_id=$(printf "%s" "$origdir" | sha256sum | cut -d" " -f1)
 
+origdir=$(readlink -f "$dir")
+
+[[ -d $origdir ]] || error "Directory $dir not found; aborted."
+
 if [[ -n $TMP ]] ; then
     tmp_base=$TMP/photos2pdf/$job_id
 elif [[ -n $XDG_RUNTIME_DIR ]] ; then
@@ -99,10 +202,6 @@ else
     tmp_base=/tmp/photos2pdf/$job_id
 fi
 
-if ! mkdir -p "$tmp_base" ; then
-    error "Could not create temporary workign directory $tmp_base; aborted"
-fi
-
 indir="$tmp_base/in"
 tmpdir="$tmp_base/tmp"
 outdir="$tmp_base/out"
@@ -189,9 +288,6 @@ for jpg in "$indir/"*.jpg ; do
             while(<>){
                 chomp;
                 next unless /(\d+)x(\d+)\+(\d+)\+(\d+)/;
-                printf
-                    STDERR
-                    "DEBUG: component: $_\n";
                 printf
                     "rectangle %d,%d,%d,%d\n",
                     $1, $2, $1+$3, $2+$4;
@@ -202,12 +298,6 @@ for jpg in "$indir/"*.jpg ; do
         uniq
     )
 
-    printf "DEBUG: connected components in \"%s\":" "$tmp1"
-    for d in "${draw[@]}" ; do
-        printf " \"%s\"" "$d"
-    done
-    printf "\n"
-
     if ! convert \
         "$tmp1" \
         -fill black -colorize 100 \
@@ -250,13 +340,6 @@ for jpg in "$indir/"*.jpg ; do
         }
     ' < "$inf")
 
-    if ! "$keep_tmpfiles" ; then
-        if ! rm -f -- "$tmp1" "$tmp2" "$trimmed" "$inf" ; then
-            warning "Could not remove temporary files in \"$dir/tmp\"."
-            rv=1
-        fi
-    fi
-
     info "Processing $base: crop=$crop ..."
 
     if ! convert \
@@ -307,7 +390,7 @@ for png in "out/"*.png ; do
         continue
     elif !  pdfjam \
         --quiet \
-        --outfile tmp \
+        --outfile "$tmpdir" \
         --paper "$paper" \
         "$jam_landscape" \
         --scale "$scale" \
@@ -334,15 +417,17 @@ while read -r pdf ; do
     input+=("$pdf")
 done < <(ls -- "$tmpdir/"*.backdropped.pdf)
 
-if ! pdftk "${input[@]}" cat output "$result" ; then
-    warning "Could not concatenate \"$result\"."
-    rv=1
-elif ! rm -f -- "tmp/"*.pdf ; then
-    warning "Could not remove tempfiles in \"$dir/tmp\"."
+if ! pdftk "${input[@]}" cat output "$pdfdir/$result_filename" ; then
+    warning "Could not concatenate \"$result_filename\"."
     rv=1
+elif ! "$keep_tmpfiles" ; then
+    if ! rm -f -- "$tmp_base" ; then
+        warning "Could not remove temporary files."
+        rv=1
+    fi
 fi
 
 if [[ $rv -ne 0 ]] ; then
-    error "One or more errors during PDF generation; aborted." "$rv"
+    error "One or more errors; aborted." "$rv"
 fi