diff --git a/scripts/convert-to-greyed-out-image.sh b/scripts/convert-to-greyed-out-image.sh
index 83a3081a..0caf9e59 100644
--- a/scripts/convert-to-greyed-out-image.sh
+++ b/scripts/convert-to-greyed-out-image.sh
@@ -6,8 +6,12 @@ out=`echo $1 | sed 's/\.\([^.]\+$\)/-greyed-out.\1/'`
 #convert -monochrome -opaque \#e5e5e5 $in $out
 #convert -modulate 100,40 $in $out
 #convert +level 25% $in $out
-convert +level 30% $in $out
+#convert +level 30% $in $out
+#convert -colorspace Gray $in $out
+#convert +level 30% -colorspace Gray $in $out
+convert -colorspace Gray +level 30% -brightness-contrast 35 $in $out
 
+# TODO: overlay same image, 1px shifted down and right, with different gray level
 
 # ------------------------------------------------
 #convert small.miff -modulate 100,40 small-grey.miff