diff --git a/examples/7color/html/html.sh b/examples/7color/html/html.sh
index b3be43e7..0de84e12 100755
--- a/examples/7color/html/html.sh
+++ b/examples/7color/html/html.sh
@@ -4,4 +4,4 @@ CWD=`pwd`
 filename=$1
 
 firefox --headless --screenshot --window-size=600,448 file://$CWD/$filename
-../image.py screenshot.png
+../image.py --file screenshot.png