I'm posting in this thread because I think my problem may be related. I'm trying to make the image in my slider display as 700x250, like I did before here: http://www.leantomedia.com. These are the actual dimensions of the original image.
In the site I'm presently working on, however, it keeps re-sizing it to 500x230 (as you mentioned above). http://portfolioanalytics.net.host01.cfdynamics.com/. Looking in the inspector of my browser, it seems to be using a different file entirely (img-500x230.jpg as opposed to img.jpg). How can I tell wordpress to just use the original file, original size?
When I look in Settings > Media I get Thumbnail Size, Medium Size, and Large Size. Nothing for Slider Image, or anything that has the dimensions 500x230.