diff --git a/tools/compareRT b/tools/compareRT
index 05f5652cf..cca18bee6 100755
--- a/tools/compareRT
+++ b/tools/compareRT
@@ -1,51 +1,59 @@
 #!/usr/bin/env bash
+#
 # compareRT version 1.0, 2014-01-24
+# compareRT version 1.1, 2015-02-24
 # Processes all images in the current dir with two different
 # RawTherapee versions and tests for differences.
+#
 # Run this script from the dir with the images you want to test.
+# Make sure the PP3 you set below is in the same dir.
 # Don't worry about non-image files.
-# In order to keep this simple, all dir names must end with /
+# Each dir specified in rtDirs and the outDir must end with /
+#
 # CC-BY-SA 3.0 DrSlony
 
-unset rtDirs outDir pp3 imgs v i
+unset rtDirs outDir pp3 imgs v i c
 
 #--- Edit these as needed.
-rtDirs=("$HOME/rt_default_Release/" "$HOME/rt_default_Release_patched/")
+rtDirs=("$HOME/rt_default_release/" "$HOME/rt_default_release_patched/")
+pp3="foo.pp3"
 outDir="/tmp/compareRT/"
-pp3="$HOME/rawtherapee/rtdata/profiles/Default.pp3"
-while IFS=$'\n' read f; do
-  imgs+=("$f")
-done < <(find . -maxdepth 1 -type f -not -iname "*.txt" -not -iname "*.pp3" | sed "s_./__" | sort)
 #---
 
+while IFS=$'\n' read f; do
+    imgs+=("$f")
+done < <(find . -maxdepth 1 -type f -not -iname "*.txt" -not -iname "*.pp3" | sed "s_./__" | sort)
+
 abort () {
-  printf "%s\n" "" "Aborted"
-  exit 1
+    printf "%s\n" "" "Aborted"
+    exit 1
 }
 trap 'abort' HUP INT QUIT ABRT TERM
 
 mkdir -p "$outDir" || exit 1
 
 i=0
-for rt in "${rtDirs[@]}"; do
-  c=1
-  v+=("$(grep "Changeset:.*" "${rt}/AboutThisBuild.txt" | sed "s/Changeset: //")")
-  printf "%s\n" "Developing images using RawTherapee changeset ${v[$i]}"
-  for img in "${imgs[@]}"; do
-    printf "%s" "${c}/${#imgs[@]} - "
-    "${rt}rawtherapee" -o "${outDir}${img%.*}_${v[$i]}.tif" -p "${pp3}" -t -Y -c "$img" | grep Processing
-    ((c++))
-  done
-  ((i++))
-  echo
+for rtDir in "${rtDirs[@]}"; do
+    c=1
+    pp3name=${pp3%.*}
+    pp3name=${pp3name#*/}
+    v+=("$(grep "Changeset:.*" "${rtDir}/AboutThisBuild.txt" | sed "s/Changeset: //")")
+    printf "%s\n" "Developing images using RawTherapee changeset ${v[$i]} - ${rtDir}"
+    for img in "${imgs[@]}"; do
+        printf "%s" "${c}/${#imgs[@]} - "
+        "${rtDir}rawtherapee" -o "${outDir}${img%.*}_${v[i]}_${pp3%.*}.tif" -p "${pp3}" -t -Y -c "$img" | grep Processing
+        ((c++))
+    done
+    ((i++))
+    echo
 done
 printf "%s\n" "Comparing images"
 hash compare 2>/dev/null || { printf "%s\n" "\"compare\" not found." "Install imagemagick (or graphicsmagick if it has \"compare\"), then re-run this script."; exit 1; }
 n=1
 for img in "${imgs[@]}"; do
-  printf "%s\n" "${n}/${c} - ${img}"
-  compare "${outDir}${img%.*}_${v[0]}.tif" "${outDir}${img%.*}_${v[1]}.tif" "${outDir}${img%.*}_compare.tif"
-  ((n++))
+    printf "%s\n" "${n}/${c} - ${img}"
+    compare -quiet "${outDir}${img%.*}_${v[0]}_${pp3%.*}.tif" "${outDir}${img%.*}_${v[1]}_${pp3%.*}.tif" "${outDir}${img%.*}_compare.tif"
+    ((n++))
 done
 
-printf "%s\n" "Finished"
+printf "%s\n" "" "${v[0]} is ${rtDirs[0]}" "${v[1]} is ${rtDirs[1]}" "Finished"