diff --git a/bin/scanpdf b/bin/scanpdf
new file mode 100755
index 0000000..9c2278d
--- /dev/null
+++ b/bin/scanpdf
@@ -0,0 +1,18 @@
+#!/usr/bin/bash
+set -e
+
+usage() {
+    echo -e "USAGE: $0 FILE.pdf"
+    exit 0
+}
+
+DEVICE='pixma:04A9178A_31A16C'
+FORMAT='png'
+RES=300
+
+if [ "$1" == '-h' ] || [[ "$1" != *.pdf ]]; then
+    usage
+fi
+
+scanimage -d "$DEVICE" --format="$FORMAT" --resolution "$RES" > "$1"
+convert "$1" "$1"
diff --git a/bin/set-ddc-light b/bin/set-ddc-light
index 6a86e2e..d3e2ecc 100755
--- a/bin/set-ddc-light
+++ b/bin/set-ddc-light
@@ -1,7 +1,7 @@
 #!/usr/bin/bash
 set -e
 
-CUR_LIGHT="$(set-light "$@")"
+CUR_LIGHT="$("$(dirname "$0")"/set-light "$@")"
 
 SCREENS="$(ddcutil detect | awk '$1 == "Display" {print $2}')"
 
diff --git a/bin/set-vol b/bin/set-vol
index 102e46d..4eaddf8 100755
--- a/bin/set-vol
+++ b/bin/set-vol
@@ -5,10 +5,10 @@ CUR="$(pactl get-sink-volume 0 | awk '$1 == "Volume:" {print substr($5, 1, lengt
 SHIFT="${1}"
 
 case "${1:0:1}" in
-    "")
+    '')
         exit 1
         ;;
-    "+"|"-")
+    '+'|'-')
         NEW="$((CUR - CUR % SHIFT + SHIFT))"
         ;;
     *)