...

diff --git a/MagickCore/composite.c b/MagickCore/composite.c
index 5b860440665510c15a22b0eb8365233f7dd04148..5d75eb5fbfc0a2270c66c3490821d6ae058b384c 100644 (file)
--- a/MagickCore/composite.c
+++ b/MagickCore/composite.c
@@ -1762,7 +1762,7 @@ MagickExport MagickBooleanType CompositeImage(Image *image,
                 break;
               }
             pixel=0.0;
-            if ((IsNaN(Da) != MagickFalse) && (IsNaN(Sca) != MagickFalse))
+            if ((IsNaN(Da) == MagickFalse) && (IsNaN(Sca) == MagickFalse))
               pixel=QuantumRange*gamma*(Sa*Da-Sa*Da*MagickMin(1.0,(1.0-Dca/Da)*
                 Sa/Sca)+Sca*(1.0-Da)+Dca*(1.0-Sa));
             break;