I have a mirrored object, which would obviously have a seam in the middle. However I'm sure the way I created the texture, it would be hard to tell.
But when seen from far away, it's extremely visible, how come?
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Nathan and me:
You can change the filtering method on your image node to "closest."
However, "Closest filtering is more diagnostic than a good solution." It is better to "use texture images with significant margins."
This is needed since objects use texture space outside of their UV maps when seen from far away explained by http://wiki.polycount.com/wiki/Edge_padding.
Nathan provides the resource en.wikipedia.org/wiki/Texture_filtering