From 5597a8d80a27ee76cbbca660a038a0273eaaed5d Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Fri, 4 Nov 2011 00:25:32 +0000
Subject: [PATCH]

---
 MagickCore/fx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/MagickCore/fx.c b/MagickCore/fx.c
index bab0cf5eb..981373fad 100644
--- a/MagickCore/fx.c
+++ b/MagickCore/fx.c
@@ -2493,6 +2493,12 @@ static MagickRealType FxEvaluateSubexpression(FxInfo *fx_info,
                (double) alpha);
           return(0.0);
         }
+      if (LocaleNCompare(expression,"drc",3) == 0)
+        {
+          alpha=FxEvaluateSubexpression(fx_info,channel,x,y,expression+3,beta,
+            exception);
+          return((MagickRealType) (alpha/(*beta*(alpha-1.0)+1.0)));
+        }
       break;
     }
     case 'E':
-- 
2.40.0