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diff --git a/magick/quantum-private.h b/magick/quantum-private.h
index d033117a1042ff851c3d96946933b8d749ac2e5a..3d88243aa65674afcbda03061176980a8e445b15 100644 (file)
--- a/magick/quantum-private.h
+++ b/magick/quantum-private.h
@@ -483,7 +483,11 @@ static inline Quantum ScaleMapToQuantum(const MagickRealType value)
 
 static inline unsigned long ScaleQuantumToLong(const Quantum quantum)
 {
+#if !defined(MAGICKCORE_HDRI_SUPPORT)
   return((unsigned long) quantum);
+#else
+  return((unsigned long) (quantum+0.5));
+#endif
 }
 
 static inline unsigned long ScaleQuantumToMap(const Quantum quantum)