From 942cf44994389fdeb19e16eebec187eb41d919d4 Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Sun, 8 Jan 2012 02:44:36 +0000
Subject: [PATCH]

---
 MagickCore/attribute.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/MagickCore/attribute.c b/MagickCore/attribute.c
index 7bb7d99d1..0fc9cd871 100644
--- a/MagickCore/attribute.c
+++ b/MagickCore/attribute.c
@@ -867,7 +867,8 @@ MagickExport MagickBooleanType SetImageDepth(Image *image,
         traits=GetPixelChannelMapTraits(image,channel);
         if (traits == UndefinedPixelTrait)
           continue;
-        q[i]=ScaleAnyToQuantum(ScaleQuantumToAny(q[i],range),range);
+        if (channel != IndexPixelChannel)
+          q[i]=ScaleAnyToQuantum(ScaleQuantumToAny(q[i],range),range);
       }
       q+=GetPixelChannels(image);
     }
-- 
2.40.0