diff -r 8b7cf4e45de7 libImaging/Antialias.c
--- a/libImaging/Antialias.c	Wed May 26 03:49:05 2010 +0200
+++ b/libImaging/Antialias.c	Wed May 26 04:17:58 2010 +0200
@@ -64,16 +64,14 @@
 
 static inline float bicubic_filter(float x)
 {
-    /* FIXME: double-check this algorithm */
-    /* FIXME: for best results, "a" should be -0.5 to -1.0, but we'll
-       set it to zero for now, to match the 1.1 magnifying filter */
-#define a 0.0
+    /* for best results, "a" should be -0.5 to -1.0 */
+#define a -0.5
     if (x < 0.0)
         x = -x;
     if (x < 1.0)
         return (((a + 2.0) * x) - (a + 3.0)) * x*x + 1;
     if (x < 2.0)
-        return (((a * x) - 5*a) * x + 8) * x - 4*a;
+        return (((x - 5) * x + 8) * x - 4) * a;
     return 0.0;
 #undef a
 }
@@ -131,7 +129,6 @@
 
     if (filterscale < 1.0) {
         filterscale = 1.0;
-        support = 0.5;
     }
     
     support = support * filterscale;