From e863c054d49031af35b73066f5394af223de7df5 Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Wed, 4 Sep 2013 11:31:30 +0000
Subject: [PATCH]

---
 MagickCore/compare.c   |  3 ++-
 MagickWand/operation.c | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/MagickCore/compare.c b/MagickCore/compare.c
index 4f00054b7..cb0f43185 100644
--- a/MagickCore/compare.c
+++ b/MagickCore/compare.c
@@ -1212,7 +1212,8 @@ MagickExport MagickBooleanType GetImageDistortion(Image *image,
   }
   *distortion=channel_distortion[CompositePixelChannel];
   channel_distortion=(double *) RelinquishMagickMemory(channel_distortion);
-  (void) FormatImageProperty(image,"distortion","%.20g",*distortion);
+  (void) FormatImageProperty(image,"distortion","%.*g",GetMagickPercision(),
+    *distortion);
   return(status);
 }
 
diff --git a/MagickWand/operation.c b/MagickWand/operation.c
index 6fb80da19..e9ab8c6c8 100644
--- a/MagickWand/operation.c
+++ b/MagickWand/operation.c
@@ -3631,6 +3631,39 @@ WandPrivate MagickBooleanType CLIListOperatorImages(MagickCLI *cli_wand,
           new_images=CombineImages(_images,(ColorspaceType) parse,_exception);
           break;
         }
+      if (LocaleCompare("compare",option+1) == 0)
+        {
+          double
+            distortion;
+
+          Image
+            *image,
+            *reconstruct_image;
+
+          MetricType
+            metric;
+
+          /*
+            Mathematically and visually annotate the difference between an
+            image and its reconstruction.
+          */
+          image=RemoveFirstImageFromList(&_images);
+          reconstruct_image=RemoveFirstImageFromList(&_images);
+          /* FUTURE - produce Exception, rather than silent fail */
+          if (reconstruct_image == (Image *) NULL)
+            break;
+          metric=UndefinedErrorMetric;
+          option=GetImageOption(_image_info,"metric");
+          if (option != (const char *) NULL)
+            metric=(MetricType) ParseCommandOption(MagickMetricOptions,
+              MagickFalse,option);
+          new_images=CompareImages(image,reconstruct_image,metric,&distortion,
+            _exception);
+          (void) distortion;
+          reconstruct_image=DestroyImage(reconstruct_image);
+          image=DestroyImage(image);
+          break;
+        }
       if (LocaleCompare("composite",option+1) == 0)
         {
           CompositeOperator
@@ -4027,6 +4060,8 @@ WandPrivate MagickBooleanType CLIListOperatorImages(MagickCLI *cli_wand,
           (void) RemapImages(_quantize_info,_images,(Image *) NULL,_exception);
           break;
         }
+      if (LocaleCompare("metric",option+1) == 0)
+        break;
       if (LocaleCompare("morph",option+1) == 0)
         {
           Image
-- 
2.40.0