commit 5597a8d80a27ee76cbbca660a038a0273eaaed5d
author cristy <urban-warrior@git.imagemagick.org> Fri Nov 04 00:25:32 2011 +0000
committer cristy <urban-warrior@git.imagemagick.org> Fri Nov 04 00:25:32 2011 +0000
tree 5d0f3c705ac6bc912f81c42813139234084fc24d
parent 984049ca617ba4e3881c36ea7228a25f6b5ae802

MagickCore/fx.c

diff --git a/MagickCore/fx.c b/MagickCore/fx.c
index bab0cf5..981373f 100644
--- a/MagickCore/fx.c
+++ b/MagickCore/fx.c
@@ -2493,6 +2493,12 @@
                (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':