diff --git a/interlace-frames.py b/interlace-frames.py
new file mode 100644
index 0000000..243e565
--- /dev/null
+++ b/interlace-frames.py
@@ -0,0 +1,53 @@
+# Copyright (C) 2014 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Script to take a set of frames (PNG files) for a recovery animation
+and turn it into a single output image which contains the input frames
+interlaced by row.  Run with the names of all the input frames on the
+command line, in order, followed by the name of the output file."""
+
+import sys
+try:
+  import Image
+  import PngImagePlugin
+except ImportError:
+  print "This script requires the Python Imaging Library to be installed."
+  sys.exit(1)
+
+frames = [Image.open(fn).convert("RGB") for fn in sys.argv[1:-1]]
+assert len(frames) > 0, "Must have at least one input frame."
+sizes = set()
+for fr in frames:
+  sizes.add(fr.size)
+
+assert len(sizes) == 1, "All input images must have the same size."
+w, h = sizes.pop()
+N = len(frames)
+
+out = Image.new("RGB", (w, h*N))
+for j in range(h):
+  for i in range(w):
+    for fn, f in enumerate(frames):
+      out.putpixel((i, j*N+fn), f.getpixel((i, j)))
+
+# When loading this image, the graphics library expects to find a text
+# chunk that specifies how many frames this animation represents.  If
+# you post-process the output of this script with some kind of
+# optimizer tool (eg pngcrush or zopflipng) make sure that your
+# optimizer preserves this text chunk.
+
+meta = PngImagePlugin.PngInfo()
+meta.add_text("Frames", str(N))
+
+out.save(sys.argv[-1], pnginfo=meta)
diff --git a/make-overlay.py b/make-overlay.py
deleted file mode 100644
index 7f931b3..0000000
--- a/make-overlay.py
+++ /dev/null
@@ -1,102 +0,0 @@
-# Copyright (C) 2011 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Script to take a set of frames (PNG files) for a recovery
-"installing" icon animation and turn it into a base image plus a set
-of overlays, as needed by the recovery UI code.  Run with the names of
-all the input frames on the command line, in order."""
-
-import sys
-try:
-  import Image
-except ImportError:
-  print "This script requires the Python Imaging Library to be installed."
-  sys.exit(1)
-
-# Find the smallest box that contains all the pixels which change
-# between images.
-
-print "reading", sys.argv[1]
-base = Image.open(sys.argv[1])
-
-minmini = base.size[0]-1
-maxmaxi = 0
-minminj = base.size[1]-1
-maxmaxj = 0
-
-for top_name in sys.argv[2:]:
-  print "reading", top_name
-  top = Image.open(top_name)
-
-  assert base.size == top.size
-
-  mini = base.size[0]-1
-  maxi = 0
-  minj = base.size[1]-1
-  maxj = 0
-
-  h, w = base.size
-  for j in range(w):
-    for i in range(h):
-      b = base.getpixel((i,j))
-      t = top.getpixel((i,j))
-      if b != t:
-        if i < mini: mini = i
-        if i > maxi: maxi = i
-        if j < minj: minj = j
-        if j > maxj: maxj = j
-
-  minmini = min(minmini, mini)
-  maxmaxi = max(maxmaxi, maxi)
-  minminj = min(minminj, minj)
-  maxmaxj = max(maxmaxj, maxj)
-
-w = maxmaxi - minmini + 1
-h = maxmaxj - minminj + 1
-
-# Now write out an image containing just that box, for each frame.
-
-for num, top_name in enumerate(sys.argv[1:]):
-  top = Image.open(top_name)
-
-  out = Image.new("RGB", (w, h))
-  for i in range(w):
-    for j in range(h):
-      t = top.getpixel((i+minmini, j+minminj))
-      out.putpixel((i, j), t)
-
-  fn = "icon_installing_overlay%02d.png" % (num+1,)
-  out.save(fn)
-  print "saved", fn
-
-# Write out the base icon, which is the first frame with that box
-# blacked out (just to make the file smaller, since it's always
-# displayed with one of the overlays on top of it).
-
-for i in range(w):
-  for j in range(h):
-    base.putpixel((i+minmini, j+minminj), (0, 0, 0))
-fn = "icon_installing.png"
-base.save(fn)
-print "saved", fn
-
-# The device_ui_init() function needs to tell the recovery UI the
-# position of the overlay box.
-
-print
-print "add this to your device_ui_init() function:"
-print "-" * 40
-print "  ui_parameters->install_overlay_offset_x = %d;" % (minmini,)
-print "  ui_parameters->install_overlay_offset_y = %d;" % (minminj,)
-print "-" * 40