diff --git a/cv/image.py b/cv/image.py
index d923f5c..3a058ef 100644
--- a/cv/image.py
+++ b/cv/image.py
@@ -10,6 +10,12 @@ def to_32F(image):
 def to_8U(image):
     if image.max() <= 1.0:
         image = image * 255.0
-    return np.clip(np.uint8(image), 0, 255)
+    else:
+        image = image.astype(np.float32)
+    range_min = np.min(image)
+    range_max = np.max(image)
+    if range_max > range_min:
+        image = (image - range_min) * (255.0 / (range_max - range_min))
+    return np.clip(np.round(image).astype(np.uint8), 0, 255)