Okay, definitely depends on resolutions, specifically the ratio of
original to final size.

For example, I created a white-filled 1600x1600 RGB image and tried
scaling to a few different sizes:

1/4: 1600x1600 => 400x400 Okay
1/5: 1600x1600 => 320x320 Artifacts
1/8: 1600x1600 => 200x200 Okay

In my original image I was scaling each side to approximately 1/4.7 the
size.  So it seems that it's at least around this ratio that the bug
appears.

-- 
Artifacts when scaling down with Sinc Lanczos3
https://bugs.launchpad.net/bugs/648379
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