Could not duplicate the error, however if you have a stroke applied to your shapes that is the same colour as your fill, that may explain what we are seeing here. :)

Boolean shape ops are done to fills only, and do not take into account line thickness on the resulting paths (this is intentional).

-C

On Sat, Apr 23, 2016 at 6:21 PM, Brynn <brynn@...3089...> wrote:

Hi Friends,
It seems like I should know the answer to this. But I don't recall
hearing about it.
Starting with these 2 rings, which have fill and no stroke:
http://inkscapecommunity.com/jd/ss/diff1.png
I duplicate both, and then Difference. At 100% zoom they look ok.
But zoom in (in this case, all the way, for best view) and you can see that
the Difference wasn't correct. http://inkscapecommunity.com/jd/ss/diff2.png
It's not a huge amount, but I would expect there shouldn't be any
difference at all. This on Windows 7, 64-bit, sp1, Inkscape 0.91, 32-bit,
exe installer.
Is that a bug? Or is there some reason it's expected not to be
precise?

Thanks for your help :-)
brynn

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