Is the image on your screen in exact pixel amounts?
If you image is say, 128.6px, Xara will expand the image to the next whole pixel amount and will anti-alias the area around the image, hence the white outline you are seeing.
This often happens if your ruler and units are set to something other than pixels, inches say.
Another possibility is the position of the image on the page. If the position of the image is not in even pixel amounts, the same thing can happen.
It will help if you show us a screen capture of the actual image size in pixels and the position on the page.
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