Added dithering flag

cc-pic.py

@@ -74,13 +74,14 @@ class Converter:
 
     MAX_DIFF = 3 * 255
 
-    def __init__(self, image: Image.Image, palette: list[int] | int = PALETTE_ADAPTIVE):
+    def __init__(self, image: Image.Image, palette: list[int] | int = PALETTE_ADAPTIVE, dither: bool = True):
+        dither_mode = Image.Dither.FLOYDSTEINBERG if dither else Image.Dither.NONE
         if isinstance(palette, list):
             img_pal = Image.new("P", (1, 1))
             img_pal.putpalette(palette)
-            self._img = image.quantize(len(palette) // 3, palette=img_pal)
+            self._img = image.quantize(len(palette) // 3, palette=img_pal, dither=dither_mode)
         else:
-            self._img = image.convert("P", palette=palette, colors=16)
+            self._img = image.convert("P", palette=palette, colors=16, dither=dither_mode)
 
         self._imgdata = self._img.load()
         self._palette: list[int] = self._img.getpalette() or []
@@ -221,6 +222,12 @@ def main():
         action="store_true",
         help="Output a Lua script instead of binary image",
     )
+    parser.add_argument(
+        "-D",
+        dest="nodither",
+        action="store_true",
+        help="Disable dithering"
+    )
     parser.add_argument(
         "-W",
         dest="width",
@@ -391,7 +398,7 @@ def main():
             else:
                 raise ValueError(f"invalid palette identifier: {args.palette!r}")
 
-            converter = Converter(canv, palette)
+            converter = Converter(canv, palette, dither=not args.nodither)
             converter._img.save("/tmp/_ccpictmp.png")
             if args.textmode:
                 with open(args.output_path, "w") as fp: