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diff --git a/MagickCore/quantize.c b/MagickCore/quantize.c
index 65a660c6991c5d8e5c0c6a644da0d280eb45e6c6..e58afc0e1939516b5bf5f366ae95ba19eee9c3e2 100644 (file)
--- a/MagickCore/quantize.c
+++ b/MagickCore/quantize.c
@@ -676,8 +676,8 @@ static MagickBooleanType AssignImageColors(Image *image,CubeInfo *cube_info,
       q=image->colormap;
       for (i=0; i < (ssize_t) image->colors; i++)
       {
-        intensity=(double) ((double) GetPixelInfoIntensity(q) <
-          ((double) QuantumRange/2.0) ? 0 : QuantumRange);
+        intensity=(double) (GetPixelInfoLuma(q) < (QuantumRange/2.0) ? 0 :
+          QuantumRange);
         q->red=intensity;
         q->green=intensity;
         q->blue=intensity;