diff --git a/sd_to_hd.py b/sd_to_hd.py
new file mode 100755
index 0000000..1f7c0d0
--- /dev/null
+++ b/sd_to_hd.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+import blup.frame
+import blup.animation
+import writebml
+import sys
+
+if len(sys.argv) != 3:
+    print('usage: %s INFILE OUTFILE' % (sys.argv[0]), file=sys.stderr)
+    sys.exit(1)
+infname = sys.argv[1]
+outfname = sys.argv[2]
+
+anim = blup.animation.load(infname)
+
+dim = blup.frame.FrameDimension(22, 16, 256, 3)
+newanim = blup.animation.Animation(dim)
+
+for f in anim:
+    newf = blup.animation.AnimationFrame(dim, f.delay)
+    for x in range(f.dimension.width):
+        for y in range(f.dimension.height):
+            newf.setPixel(x + 2, y*2, tuple(map(lambda x: int((x/anim.dimension.depth)*dim.depth), f.getPixel(x, y))))
+            newf.setPixel(x + 2, y*2 + 1, tuple(map(lambda x: int((x/anim.dimension.depth)*dim.depth), f.getPixel(x, y))))
+    newanim.addFrame(newf)
+
+writebml.writeBml(newanim, outfname)
+