X-Git-Url: https://granicus.if.org/sourcecode?a=blobdiff_plain;f=MagickCore%2Fcomposite.c;h=d4dd47e5a65ea88412b9b46566cc4c69fce5d5b0;hb=b3f97ae45019a91b30792a6fa42d81a2689a7025;hp=445c2efc9d29a884096b0068ebfaefb2957372e1;hpb=47c61c996128275174b8a120ab6a88a5c1bec3d3;p=imagemagick

diff --git a/MagickCore/composite.c b/MagickCore/composite.c
index 445c2efc9..d4dd47e5a 100644
--- a/MagickCore/composite.c
+++ b/MagickCore/composite.c
@@ -1688,13 +1688,15 @@ MagickExport MagickBooleanType CompositeImage(Image *image,
           case LightenCompositeOp:
           case ModulusSubtractCompositeOp:
           {
-            gamma=1.0-alpha;
+            gamma=PerceptibleReciprocal(1.0-alpha);
             break;
           }
           default:
+          {          
+            gamma=PerceptibleReciprocal(alpha);
             break;
+          }
         }
-        gamma=PerceptibleReciprocal(alpha);
         pixel=Dc;
         switch (compose)
         {