diff --git a/markup/img.py b/markup/img.py
index 99fefb8..09bb72b 100644
--- a/markup/img.py
+++ b/markup/img.py
@@ -33,7 +33,7 @@ def find_shapes(image_path):
         print('unhandled image mode: {}'.format(img.mode))
         return None
 
-    alpha_layer = alpha_layer.filter(ImageFilter.GaussianBlur(5))
+    alpha_layer = alpha_layer.filter(ImageFilter.GaussianBlur(1))
 
     threshold = 5
     alpha_layer = alpha_layer.point(lambda p: p > threshold and 255)