diff -r b72c6db6890b -r 5dc02b23752f src/plugins/imageformats/tiff/qtiffhandler.cpp
--- a/src/plugins/imageformats/tiff/qtiffhandler.cpp	Wed Jun 23 19:07:03 2010 +0300
+++ b/src/plugins/imageformats/tiff/qtiffhandler.cpp	Tue Jul 06 15:10:48 2010 +0300
@@ -385,8 +385,8 @@
 
     const bool increasing = (colorTable.at(0) == 0xff000000);
     for (int i = 0; i < 256; ++i) {
-        if (increasing && colorTable.at(i) != qRgb(i, i, i)
-            || !increasing && colorTable.at(i) != qRgb(255 - i, 255 - i, 255 - i))
+        if ((increasing && colorTable.at(i) != qRgb(i, i, i))
+            || (!increasing && colorTable.at(i) != qRgb(255 - i, 255 - i, 255 - i)))
             return false;
     }
     return true;