Strange issue with PNG files

I am working with a PNG file and noticed something odd with it that I am hoping someone can explain since I am not familiar enough with the PNG file format at this time.

Basically, when I use:

fileImage = [[[NSImage alloc] initWithContentsOfFile:filePath] autorelease];
NSSize imageSize = [fileImage size];
NSLog( @"Have Image of size - %@", NSStringFromSize( imageSize ) );

to read the image and then take a look at the result of [fileImage size], I am told the image is {5.76086, 5}.

Now, the odd thing is that I know the image is 16x14. I can confirm this by opening the image with GraphicConverter.

However, when I open the image with GraphicConverter, it opens the image up at ~36% of it's normal size. Now, ~36% of the normal size is {5.76086, 5} - at least I am assuming this isn't a coincidence.

So, the question is, does anyone know what is going on here? How can I get NSImage to read the image in at the normal size instead of the smaller one?