diff --git a/monolens/intro.py b/monolens/intro.py
index 5f4d67c..8c591db 100644
--- a/monolens/intro.py
+++ b/monolens/intro.py
@@ -15,9 +15,10 @@ def __init__(self):
         self.setWindowFlag(QtCore.Qt.WindowCloseButtonHint, False)
 
         with open(Path(__file__).parent / ".." / "README.md") as f:
-            m = re.search("<!-- usage begin -->\n(.+?)\n<!--", f.read(), re.DOTALL)
+            tx = f.read()
+            m = re.search("<!-- usage begin -->\n(.+?)\n<!--", tx, re.DOTALL)
             usage = m.group(1).split("\n-")
-        usage = "".join(f"<li>{x}</li>" for x in usage)
+        usage = "".join(f"<li>{x}</li>" for x in usage if x and not x.isspace())
 
         tx = f"""<h1 align="center">Welcome to Monolens</h1>
         <p>Monolens allows you to view part of your screen in grayscale.</p>
diff --git a/monolens/util.py b/monolens/util.py
index db04e12..0382b7e 100644
--- a/monolens/util.py
+++ b/monolens/util.py
@@ -67,6 +67,7 @@ def _grayscale(d, s, argb):
         sg = s[i, g]
         sb = s[i, b]
         c = clip(0.299 * sr + 0.587 * sg + 0.114 * sb, 0, 255)
+        d[i, a] = 255
         d[i, r] = c
         d[i, g] = c
         d[i, b] = c
@@ -88,6 +89,7 @@ def _colorblindness(d, s, cb, argb):
         dr = cb[0, 0] * sr + cb[0, 1] * sg + cb[0, 2] * sb
         dg = cb[1, 0] * sr + cb[1, 1] * sg + cb[1, 2] * sb
         db = cb[2, 0] * sr + cb[2, 1] * sg + cb[2, 2] * sb
+        d[i, a] = 255
         d[i, r] = clip(dr, 0, 255)
         d[i, g] = clip(dg, 0, 255)
         d[i, b] = clip(db, 0, 255)