diff --git a/examples/butterfly_test.py b/examples/butterfly_test.py
old mode 100644
new mode 100755
diff --git a/examples/circles.py b/examples/circles.py
old mode 100644
new mode 100755
index 46b3f1d..7c90ce2
--- a/examples/circles.py
+++ b/examples/circles.py
@@ -1,6 +1,7 @@
 import axi
 import math
 import random
+import sys
 
 def circle(cx, cy, r, n):
     points = []
@@ -35,8 +36,10 @@ def main():
     add(0, 0, 64, paths)
     drawing = axi.Drawing(paths).rotate_and_scale_to_fit(11, 8.5).sort_paths()
     im = drawing.render()
-    im.write_to_png('out.png')
-    axi.draw(drawing)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        drawing.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(drawing)
 
 if __name__ == '__main__':
     main()
diff --git a/examples/device_test.py b/examples/device_test.py
old mode 100644
new mode 100755
index eb47807..9c601d4
--- a/examples/device_test.py
+++ b/examples/device_test.py
@@ -1,5 +1,6 @@
 import axi
 import time
+import sys
 
 from math import sin, cos, pi
 
@@ -17,7 +18,10 @@ def main():
     for i in range(10):
         path.extend(circle(4, 4, (i + 1) * 0.2, 3600))
     drawing = axi.Drawing([path]).simplify_paths(0.001)
-    axi.draw(drawing)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        drawing.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(drawing)
 
 if __name__ == '__main__':
     main()
diff --git a/examples/dragon_curve.py b/examples/dragon_curve.py
old mode 100644
new mode 100755
index 2e82f07..d508176
--- a/examples/dragon_curve.py
+++ b/examples/dragon_curve.py
@@ -1,4 +1,5 @@
 import axi
+import sys
 
 def main(iteration):
     turtle = axi.Turtle()
@@ -9,7 +10,10 @@ def main(iteration):
         else:
             turtle.circle(1, 90, 36)
     drawing = turtle.drawing.rotate_and_scale_to_fit(11, 8.5, step=90)
-    axi.draw(drawing)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        drawing.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(drawing)
 
 if __name__ == '__main__':
     main(12)
diff --git a/examples/field.py b/examples/field.py
old mode 100644
new mode 100755
index 411284a..643dcfa
--- a/examples/field.py
+++ b/examples/field.py
@@ -1,6 +1,7 @@
 import axi
 import random
 import time
+import sys
 
 from math import hypot, atan2, sin, cos, pi
 
@@ -64,7 +65,10 @@ def main():
         paths.append(path)
 
     drawing = axi.Drawing(paths).sort_paths().simplify_paths(0.001)
-    axi.draw(drawing)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        drawing.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(drawing)
 
 if __name__ == '__main__':
     main()
diff --git a/examples/growth.py b/examples/growth.py
old mode 100644
new mode 100755
index edcfc07..162b2fe
--- a/examples/growth.py
+++ b/examples/growth.py
@@ -1,5 +1,6 @@
 import axi
 import random
+import sys
 
 from collections import defaultdict
 from math import pi, sin, cos, hypot, floor
@@ -129,8 +130,10 @@ def main():
     points, pairs = poisson_disc(0, 0, 11, 8.5, 0.035, 32)
     path = make_path(pairs)
     drawing = axi.Drawing([path]).scale_to_fit(11, 8.5)
-    drawing.render().write_to_png('out.png')
-    axi.draw(drawing)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        drawing.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(drawing)
 
 if __name__ == '__main__':
     main()
diff --git a/examples/lindenmayer.py b/examples/lindenmayer.py
old mode 100644
new mode 100755
index e85034c..5a0ac83
--- a/examples/lindenmayer.py
+++ b/examples/lindenmayer.py
@@ -1,4 +1,5 @@
 import axi
+import sys
 
 def main():
     system = axi.LSystem({
@@ -14,8 +15,10 @@ def main():
     d = d.rotate_and_scale_to_fit(12, 8.5, step=90)
     # d = d.sort_paths()
     # d = d.join_paths(0.015)
-    d.render().write_to_png('out.png')
-    axi.draw(d)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        d.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(d)
 
 if __name__ == '__main__':
     main()
diff --git a/examples/paths.py b/examples/paths.py
old mode 100644
new mode 100755
diff --git a/examples/piet.py b/examples/piet.py
old mode 100644
new mode 100755
index 9dc4353..1e77821
--- a/examples/piet.py
+++ b/examples/piet.py
@@ -1,6 +1,7 @@
 from shapely.geometry import LineString
 import axi
 import random
+import sys
 
 X1 = 0
 X2 = 11
@@ -57,8 +58,10 @@ def main():
     d = axi.Drawing(paths)
     d = d.sort_paths()
     d = d.join_paths(0.001)
-    d.render().write_to_png('out.png')
-    axi.draw(d)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        d.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(d)
 
 if __name__ == '__main__':
     main()
diff --git a/examples/stars.py b/examples/stars.py
old mode 100644
new mode 100755
index 71873b7..7ee2cb3
--- a/examples/stars.py
+++ b/examples/stars.py
@@ -1,6 +1,7 @@
 import axi
 import math
 import random
+import sys
 
 from axi.spatial import Index
 from poisson_disc import poisson_disc
@@ -38,9 +39,10 @@ def main():
     drawing = axi.Drawing(paths)
     drawing = drawing.remove_paths_outside(11, 8.5)
     drawing = drawing.sort_paths()
-    # im = drawing.render()
-    # im.write_to_png('out.png')
-    axi.draw(drawing)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        drawing.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(drawing)
 
 if __name__ == '__main__':
     main()
diff --git a/examples/text.py b/examples/text.py
old mode 100644
new mode 100755
index ccabbaf..b1864b5
--- a/examples/text.py
+++ b/examples/text.py
@@ -1,4 +1,5 @@
 import axi
+import sys
 
 LINES = [
     'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor',
@@ -39,7 +40,10 @@ def main():
     d = d.join_paths(0.01)
     d.render().write_to_png('out.png')
     print sum(x.t for x in axi.Device().plan_drawing(d))
-    # axi.draw(d)
+    if len(sys.argv) > 1 and sys.argv[1].endswith(".png"):
+        d.render().write_to_png(sys.argv[1])
+    else:
+        axi.draw(d)
 
 if __name__ == '__main__':
     main()
diff --git a/examples/tree_rings.py b/examples/tree_rings.py
old mode 100644
new mode 100755
index 7401981..81ec2f2
--- a/examples/tree_rings.py
+++ b/examples/tree_rings.py
@@ -39,7 +39,10 @@ def main():
     paths = create_paths(Image.open(sys.argv[1]))
     drawing = axi.Drawing(paths).rotate_and_scale_to_fit(11, 8.5, step=90)
     drawing = drawing.sort_paths().join_paths(0.02)
-    axi.draw(drawing)
+    if len(sys.argv) > 2 and sys.argv[2].endswith(".png"):
+        drawing.render().write_to_png(sys.argv[2])
+    else:
+        axi.draw(drawing)
 
 if __name__ == '__main__':
     main()