SVN commit 595585 by berger:

disable bicubic and lanczos as they don't work
CCBUG:135656


 M  +2 -2      kis_filter_strategy.cc  


--- branches/koffice/1.6/koffice/krita/core/kis_filter_strategy.cc #595584:595585
@@ -183,9 +183,9 @@
         m_singleton->add(new KisTriangleFilterStrategy);
         m_singleton->add(new KisBellFilterStrategy);
         m_singleton->add(new KisBSplineFilterStrategy);
-        m_singleton->add(new KisLanczos3FilterStrategy);
+//         m_singleton->add(new KisLanczos3FilterStrategy);
         m_singleton->add(new KisMitchellFilterStrategy);
-        m_singleton->add(new KisCubicFilterStrategy);
+//         m_singleton->add(new KisCubicFilterStrategy);
     }
     return KisFilterStrategyRegistry::m_singleton;
 }

Which automatically means this bug is confirmed.

*** Bug 137166 has been marked as a duplicate of this bug. ***

Duplicate of 137325 (which is a kind of ginormous meta-scaling bug)

*** This bug has been marked as a duplicate of 137325 ***

Both the Bicubic and Lanczos3 filters produce a transparent image when
performing a scale image; other filters seem ok. In my experience, saving the
resulting image produces a black picture.