PNG Import Size Discrepancy

I’m using png’s prominently for one of my flash projects and I just noticed every time I import them the height and width of the imported object is -.1 px the actual size of the png file. So a 17px by 17px image goes to stage as a 16.9px by 16.9px. What’s up with that? I don’t see any documentation on it. Some kind of glitch? Or have I just gone crazy?:crazy: