From: Cristy <mikayla-grace@urban-warrior.org>
Date: Sat, 11 May 2019 17:42:08 +0000 (-0400)
Subject: https://imagemagick.org/discourse-server/viewtopic.php?f=1&t=35970
X-Git-Tag: 7.0.8-45~9
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c3af9a255cd51a422cb478d1611b30c8860e07dc;p=imagemagick

https://imagemagick.org/discourse-server/viewtopic.php?f=1&t=35970
---

diff --git a/MagickCore/signature.c b/MagickCore/signature.c
index 10223eab5..e17b92c1f 100644
--- a/MagickCore/signature.c
+++ b/MagickCore/signature.c
@@ -476,7 +476,7 @@ MagickExport MagickBooleanType SignatureImage(Image *image,
   char
     *hex_signature;
 
-  double
+  float
     pixel;
 
   register const Quantum
@@ -537,9 +537,10 @@ MagickExport MagickBooleanType SignatureImage(Image *image,
 
         PixelChannel channel = GetPixelChannelChannel(image,i);
         PixelTrait traits = GetPixelChannelTraits(image,channel);
-        if (traits == UndefinedPixelTrait)
+        if ((traits == UndefinedPixelTrait) ||
+            ((traits & UpdatePixelTrait) == 0))
           continue;
-        pixel=QuantumScale*p[i];
+        pixel=(float) (QuantumScale*p[i]);
         if (signature_info->lsb_first == MagickFalse)
           for (j=(ssize_t) sizeof(pixel)-1; j >= 0; j--)
             *q++=(unsigned char) ((unsigned char *) &pixel)[j];