Massive amount scientific data often need to be visualized in ultra-large images for scientific discovery. Although ultra-high resolution tiled-display environments have been widely used, there still lacks of proper image viewers that can display ultra-large images with billions of pixels in tiled-display environments. To address the problem, we propose Magic View, an optimized ultra-large scientific image viewer for SAGE tiled-display environment. It can achieve real-time interactive performance in viewing images with billions of pixels. Our experiments show that the performance of Magic View are at lease 8x better than Juxta View, another ultra-large image viewer for SAGE.