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by ThomPete 6042 days ago
I think it has to do with how to get perfect pixel in illustrator. If you just draw a line even if you have your rulers set to pixel you will get anti-aliasing once you render it in for instance photoshop. So what you do is that you offset it in points as far as I can remember by .5pt that way PS will render it nicely.

Having said that I still don't know why someone thought of this to be HN worthy it's a rather old problem with a rather old solution.