Png exported from Illustrator is 1px too big - why?

Hi,
I have designed a button for a GUI at 80px by 49px within an artboard that is exactly the same size.
I have exported the artboard as a .png.
When I look at the .png details in Adobe bridge it shows the dimensions as 81px by 50px (1px bigger in both directions.
I have imported this .png into my wireframing software (Axure) and this confirms that the .png is 81x40px.
Why is Illustrator changing the size?
Thanks

Is now!
Sorry it's been a while and I totally forgot about that
Doh
Thanks

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This is a strange one, which has taken up a lot of time to try to solve.
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johnivanwhite wrote:
Hi John M,
Microsoft .WMF format. [.WTF?] is pretty good in the resultant PDF. However, when you zoom in to the PDF, the curves get a bit rounded-polygonal, in a smooth-bumpy way. Odd - not a huge issue unless people zoom in. However, it is evident if they print it. And they will.
Right. What you're seeing there is the Windows Metafile format's lack of support for bezier curves. Close inspection reveals curves that are made up of many small straight line segments.
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That's why I asked about platform. Running Windows, it's possible to Copy from Illustrator and Paste Special > Enhanced Metafile in MS Office apps. With that procedure, the result is vectors that land in Office without the full WMF conversion and resulting segmentation.
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if you export the file with the choice of art optimize or type optimize you will get this antialias artifact if you choose none as the optimize option then you will not get this anti alas artifact since there is no anti alias being applied.
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You have a third option and that is to keeep your optimization options and set the color background shape to align to pixel grid on the object level and not the document level using the align to pixel grid option in the transform panel you have to show options in the transform panel to see this option.
Here is no align to lixel grid with none for optimizing
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I am having an issue that's driving me crazy, I've tried everything and I still can't figure out why it's doing this.
I created a template in Illustrator, very basic, just some 1 inch circles.   The goal is to color them in different color palettes and then save it as a PDF.   In Illustrator, they show up completely fine, the pattern fills sometimes have those little seam lines but those don't show up at 100% so I'm not worried about that.
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http://img.photobucket.com/albums/v648/hazelsmrf/line.jpg
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Png exported from Illustrator is 1px too big - why?

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