From f52a18c55059ce66931d72d38c1cda71b56bda0e Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Sat, 18 Jan 2014 15:32:19 +0000
Subject: [PATCH]

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

diff --git a/MagickWand/compare.c b/MagickWand/compare.c
index 019a9d4c5..b7f71f4d8 100644
--- a/MagickWand/compare.c
+++ b/MagickWand/compare.c
@@ -954,7 +954,8 @@ WandExport MagickBooleanType CompareImagesCommand(ImageInfo *image_info,
     difference_image=CompareImages(image,reconstruct_image,metric,&distortion,
       exception);
   else
-    if (similarity_image == (Image *) NULL)
+    if ((similarity_image == (Image *) NULL) &&
+        (metric != PerceptualHashErrorMetric))
       ThrowCompareException(OptionError,"ImageWidthsOrHeightsDiffer",
         image->filename)
     else
-- 
2.40.0