diff --git a/ref/colors.txt b/ref/colors.txt
deleted file mode 100644
index dd61939..0000000
--- a/ref/colors.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-000000
-555555
-aaaaaa
-ffffff
-
-111111
-222222
-333333
-444444
-555555
-666666
-777777
-888888
-999999
-aaaaaa
-bbbbbb
-cccccc
-dddddd
-ffffff
diff --git a/ref/screen_shot-48766.gif b/ref/screen_shot-48766.gif
deleted file mode 100644
index 05a33c7..0000000
Binary files a/ref/screen_shot-48766.gif and /dev/null differ
diff --git a/ref/screen_shot-48767.gif b/ref/screen_shot-48767.gif
deleted file mode 100644
index bb5d385..0000000
Binary files a/ref/screen_shot-48767.gif and /dev/null differ
diff --git a/ref/screen_shot-54026.gif b/ref/screen_shot-54026.gif
deleted file mode 100644
index ebfcac7..0000000
Binary files a/ref/screen_shot-54026.gif and /dev/null differ
diff --git a/ref/TESTPATTERN6.png b/ref/testpattern.png
similarity index 100%
rename from ref/TESTPATTERN6.png
rename to ref/testpattern.png