diff --git a/tools/build-ega-mp4.sh b/tools/build-ega-mp4.sh
index a069549..1f3fccd 100755
--- a/tools/build-ega-mp4.sh
+++ b/tools/build-ega-mp4.sh
@@ -21,6 +21,7 @@ do
 	# echo $source "==>" $destname
 
 	convert	$source					\
+		-normalize				\
 		-resize   '640x350!' 			\
 		-dither   none				\
 		-remap    datas/ega-colors.png		\