Photon re-sizing larger images

I installed photon and it is re-sizing images larger than 640 pixels to that width. This is causing problems on a number of images. My site is http://pxpfoto.com. An example is http://i2.wp.com/pxpfoto.com/wp-content/uploads/newborn-baseball2.png?w=640 which is one of the images in my home page slideshow. The original image is http://pxpfoto.com/wp-content/uploads/newborn-baseball2.png which is 710 pixels wide. Now that’s it’s being served through Photon it’s smaller. What can I do to have the image served through Photon be the original width, which in this case is 710 pixels?

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