WordPress keeps resizing my 947×947 image down to 500×500 (full-size option)

I figured it out. The hint from user29296 is what led me to this: I had to insert the image using CSS, not html. Check the page now: http://macaulay.cuny.edu/eportfolios/menatwork/test-page/

The code was this:

<style type="text/css">
#image
{
position:absolute;
width:947px !important;
height:947px;
background-image:url('http://macaulay.cuny.edu/eportfolios/menatwork/files/2013/05/test.jpg');
background-repeat:no-repeat;
}
</style>
<div id="image"></div>

Thanks for the replies!