From 86bd50663dd74d48a0540174e8ae7267f9b96bb5 Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Thu, 14 Sep 2017 04:51:49 -0400
Subject: [PATCH] 
 https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=32407

---
 coders/gif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/coders/gif.c b/coders/gif.c
index ab2d76e8d..6202f5e16 100644
--- a/coders/gif.c
+++ b/coders/gif.c
@@ -1255,7 +1255,7 @@ static Image *ReadGIFImage(const ImageInfo *image_info,ExceptionInfo *exception)
     image->colors=BitSet((int) flag,0x80) == 0 ? global_colors : one <<
       ((size_t) (flag & 0x07)+1);
     if (opacity >= (ssize_t) image->colors)
-      opacity=(-1);
+      image->colors=opacity+1;
     image->page.width=page.width;
     image->page.height=page.height;
     image->page.y=page.y;
-- 
2.40.0