Miscellaneous cleanup

- Remove old dither code from dither.py
- Commit an old color-distance experiment

dither.py

@@ -108,38 +108,3 @@ def pattern_dither(img, palette, *, pat_size=4, amount=0.75):
     result.putpalette([c for rgb in old_palette for c in rgb])
     result.putdata([old_palette_indexes[i] for i in output_indexes])
     return result
-
-def dither_pixel(img, xy, pal):
-    global bayer
-    pal2 = [np.array(rgb_to_linear(c)) for c in pal]
-    counts = [0]*len(pal)
-    x, y = xy
-    def diff(c1, c2):
-        return sum((c1-c2)**2)
-    def nearest(rgb):
-        cost, index = min((diff(rgb,c), i) for i,c in enumerate(pal2))
-        return index
-    color = np.array(rgb_to_linear(img.getpixel(xy)))
-    err = np.array([0.0,0.0,0.0])
-    for _ in range(bayer.size):
-        err += color
-        i = nearest(err)
-        counts[i] += 1
-        err -= pal2[i]
-    thresh = bayer[y % bayer.shape[0]][x % bayer.shape[1]]
-    for i, count in enumerate(counts):
-        thresh -= count
-        if thresh < 0:
-            return i
-
-dithered = Image.new('P', resized.size)
-dithered.putpalette([x for rgb in PICO_RGB[:16] for x in rgb])
-def do_it():
-    global dithered, resized
-    for x in tqdm(range(128)):
-        for y in range(128):
-            i = dither_pixel(resized, (x,y), PICO_RGB[:16])
-            dithered.putpixel((x,y), i)
-# import cProfile
-# cProfile.run('do_it()')
-#do_it()