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diff --git a/MagickCore/resample.c b/MagickCore/resample.c
index 99aac326f3f7df875c7b4609b577d3d079fd0e58..c938d277d58caa1f20659f68633bf377879710f8 100644 (file)
--- a/MagickCore/resample.c
+++ b/MagickCore/resample.c
@@ -666,7 +666,8 @@ MagickExport MagickBooleanType ResamplePixelColor(
     Finialize results of resampling
   */
   divisor_m = 1.0/divisor_m;
-  pixel->alpha = (double) ClampToQuantum(divisor_m*pixel->alpha);
+  if (pixel->alpha_trait != UndefinedPixelTrait)
+    pixel->alpha = (double) ClampToQuantum(divisor_m*pixel->alpha);
   divisor_c = 1.0/divisor_c;
   pixel->red   = (double) ClampToQuantum(divisor_c*pixel->red);
   pixel->green = (double) ClampToQuantum(divisor_c*pixel->green);