From: Cristy <urban-warrior@imagemagick.org>
Date: Sun, 14 Oct 2018 00:03:21 +0000 (-0400)
Subject: ...
X-Git-Tag: 7.0.8-13~15
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=6401c7439b39d875d8d3342b9a0f0aee75925f69;p=imagemagick

...
---

diff --git a/MagickCore/compare.c b/MagickCore/compare.c
index 345e7c699..ccc45ecb2 100644
--- a/MagickCore/compare.c
+++ b/MagickCore/compare.c
@@ -1239,7 +1239,7 @@ static MagickBooleanType GetPeakSignalToNoiseRatio(const Image *image,
     if (fabs(distortion[i]) < MagickEpsilon)
       distortion[i]=INFINITY;
     else
-      distortion[i]=20.0*MagickLog10(1.0/sqrt(distortion[i]));
+      distortion[i]=10.0*MagickLog10(1.0)-10.0*MagickLog10(distortion[i]);
   return(status);
 }