From 1ed565ff8d1d5139d0ff5fcf9a8a3dda44156bb1 Mon Sep 17 00:00:00 2001
From: kris <kris.kennaway@gmail.com>
Date: Tue, 2 Nov 2021 22:14:42 +0000
Subject: [PATCH] Fix a bug with palette depths < 8

---
 dither.pyx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dither.pyx b/dither.pyx
index 8cf8559..6bcc4b2 100644
--- a/dither.pyx
+++ b/dither.pyx
@@ -66,7 +66,7 @@ cdef inline unsigned char shift_pixel_window(
     Returns: n-bit value representing shifted pixel window
     """
     cdef unsigned char window_mask = 0xff >> (8 - window_width)
-    return ((last_pixels >> shift_right_by) | (next_pixels << (8 - shift_right_by))) & window_mask
+    return ((last_pixels >> shift_right_by) | (next_pixels << (window_width - shift_right_by))) & window_mask
 
 
 # Look ahead a number of pixels and compute choice for next pixel with lowest total squared error after dithering.