Gwenview - Image sharpness

I use Linux for my photo work and frequently use Gwenview as my image viewer. However, it appears that the new KDE 4 version of the program blurs image details, rendering the program useless as a tool to assess image sharpness.

There is a striking difference when showing the same image side-by-side using Gwenview and Kuickshow, or Faststone (Wine).

I have been looking for a way to circumvent this but have found none.