Resize bug (Bilinear and nearest neighbour)

[ost]

Maybe I'm picky here, but I'm doing some technical tests here.
When resizing a 10x10 pixel image (just a symmetric simple X) to either 10x15 or 15x10 using the mentioned methods, the result is not what I expect. The symmetry is lost. My bet would be a rounding issue...

Im on version 1.97.8 (Sep 20 2010)
Libformat Version 5.76

[XnTriq]

I believe that's typical for Nearest-neighbor interpolation, ...

• Adobe Photoshop v6.0.1:
  

... but I can confirm a bug with Bilinear interpolation

• Adobe Photoshop v6.0.1:
  

• XnView v1.97.8:
  

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[helmut]

Thank you, XnTriq for this excellent demo. A clear bug in the bilinear interpolation.