...

diff --git a/MagickCore/thread-private.h b/MagickCore/thread-private.h
index c3696accdec593593d304deb89519cfb2bfd76bd..3d612a564f43e60ca75110ffd09a2c704210320d 100644 (file)
--- a/MagickCore/thread-private.h
+++ b/MagickCore/thread-private.h
@@ -36,7 +36,7 @@ extern "C" {
      (GetImagePixelCacheType(source) == MapCache)) && \
     ((GetImagePixelCacheType(destination) == MemoryCache) || \
      (GetImagePixelCacheType(destination) == MapCache))) ? \
-    MagickMax(1,MagickMin(GetMagickResourceLimit(ThreadResource),(chunk)/16)) : 1)
+    MagickMax(1,MagickMin(GetMagickResourceLimit(ThreadResource),(chunk)/256)) : 1)
 #define magick_number_threads(source,destination,number_threads) \
   num_threads(( \
     ((GetImagePixelCacheType(source) == MemoryCache) || \