From: Cristy <urban-warrior@imagemagick.org>
Date: Fri, 21 Jun 2019 22:49:58 +0000 (-0400)
Subject: https://github.com/ImageMagick/ImageMagick/issues/1610
X-Git-Tag: 7.0.8-50~20
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8187d2d8fd010d2d6b1a3a8edd935beec404dddc;p=imagemagick

https://github.com/ImageMagick/ImageMagick/issues/1610
---

diff --git a/MagickCore/pixel-accessor.h b/MagickCore/pixel-accessor.h
index 8af0e369c..56fba6c97 100644
--- a/MagickCore/pixel-accessor.h
+++ b/MagickCore/pixel-accessor.h
@@ -111,7 +111,7 @@ static inline PixelTrait GetPixelCbTraits(const Image *magick_restrict image)
 static inline Quantum GetPixelChannel(const Image *magick_restrict image,
   const PixelChannel channel,const Quantum *magick_restrict pixel)
 {
-  if (image->channel_map[channel].traits == UndefinedPixelTrait)
+  if (image->channel_map[image->channel_map[channel].offset].traits == UndefinedPixelTrait)
     return((Quantum) 0);
   return(pixel[image->channel_map[channel].offset]);
 }