Want to see image detail? You can expand ＆ automatically scroll-view; see image details you had not noticed before. The VERTICAL SCROLLER is the only image viewer with «real» automatic scroll. SNS such as Facebook, Instagram, Tumbr etc..are using high definition images. Have you downloaded the images and displayed them on the monitor? Most images are larger than the monitor and you only see a condensed version. It's not the image that the photographer wishes to show. The vertical scroller enlarges the image in the horizontal direction and displays an enlarged image. Parts of the image not displayed because of the enlargement are shown by automatic vertical scroll. You get an enhanced view much closer to what the photographer really wants to show.