diff --git a/color_convert.py b/color_convert.py
index 12b218f..34a43b8 100644
--- a/color_convert.py
+++ b/color_convert.py
@@ -110,7 +110,7 @@ def resize(im, l):
         size=(l, l),
         resample=Image.Resampling.LANCZOS,
     )
-    new.save(f"{l:03}.png")
+    #new.save(f"{l:03}.png")
     return new
 
 def generate_mips(im):
@@ -129,9 +129,10 @@ def write_mip(f, mip: Image, is_twiddled: bool, convert):
     colors = list(convert_colors(convert, pixels))
     assert len(colors) == width * height, len(colors)
     if is_twiddled:
-        new_colors = [0] * width * height
+        npot_height = npot(height)
+        new_colors = [0] * width * npot_height
         max_twiddle_ix = twiddle_texture(new_colors, colors, width, height)
-        assert max_twiddle_ix + 1 == width * height, (max_twiddle_ix, width, height)
+        #assert max_twiddle_ix + 1 == width * height, (max_twiddle_ix, width, height)
         colors = new_colors[:max_twiddle_ix+1]
     pack_colors(f, colors)
 
diff --git a/twiddle.py b/twiddle.py
index 7dc9eca..d413569 100644
--- a/twiddle.py
+++ b/twiddle.py
@@ -49,11 +49,11 @@ def npot(v):
     return v
 
 def texture(dst, src, width, height):
-    #pot_height = npot(height)
+    pot_height = npot(height)
     max_twiddle_ix = -1
     for y in range(height):
         for x in range(width):
-            twiddle_ix = from_xy(x, y, width, height)
+            twiddle_ix = from_xy(x, y, width, pot_height)
             value = src[y * width + x]
             dst[twiddle_ix] = value
             if twiddle_ix > max_twiddle_ix: