Bernhard

Hi,
 
I am using Affinity Designer to make some artwork for a mobile game. It's been great so far, but now I've hit a little road bump.
 
I constructed a blue square of 24 by 24px, which I would like to export at that size, with crisp edges (to use as a tile in a tilemap).
 
However, the horizontal edges are getting blurred. It seems they are aligned at a half pixel boundary. The resulting export slice is 24px by 25px.
 
Is there a way to fix this? I have looked through the forum but haven't had any luck.
 
Thanks for your help,
 
Bernhard