If the image you chose to apply HDR to did not have a wide range of exposure within it, than you will not see much, if any, difference in the HDR the camera produced. The purpose of the HDR is to use it when a scene has a wider range of exposure than the film, or in this case, the chip can handle. So the HDR takes 3 exposures of the same scene, say -2, 0, +2, and takes the best of each, so it can cover the full range of the image without any over or under exposure. This may not always be best. As the image can have low contrast and a flat look to it. But used carefully, under the photographers control, can be used to improve the final product.