--- openexr-1.7.0/exrmakepreview/makePreview.cpp	Mon Jun  5 04:04:52 2006
+++ openexr-1.7.0-patch/exrmakepreview/makePreview.cpp	Sat Dec 18 21:19:41 2010
@@ -78,7 +78,7 @@
     // at 0.0, 0.0, and 5.0 respectively.
     //
 
-    float x = max (0.f, h * m);
+    float x = max ((double)0.f, (double)h * m);
 
     if (x > 1)
 	x = 1 + knee (x - 1, 0.184874f);
@@ -132,7 +132,7 @@
 	    preview.r = gamma (pixel.r, m);
 	    preview.g = gamma (pixel.g, m);
 	    preview.b = gamma (pixel.b, m);
-	    preview.a = int (clamp (pixel.a * 255.f, 0.f, 255.f) + .5f);
+	    preview.a = int (clamp ((double)pixel.a * 255.f, (double)0.f, (double)255.f) + .5f);
 	}
     }
 }