diff --git a/src/ocrmypdf/filters.py b/src/ocrmypdf/filters.py
deleted file mode 100644
index 7e904876..00000000
--- a/src/ocrmypdf/filters.py
+++ /dev/null
@@ -1,10 +0,0 @@
-import PIL.ImageOps
-from PIL import Image
-
-
-def invert(im):
-    return PIL.ImageOps.invert(im.convert('L'))
-
-
-def whiteout(im):
-    return Image.new(im.mode, im.size)