Long Picture Viewer support convenient experience for examining photo or picture, it has these function: 1. Auto scale for long picture, easy to view 2. A lots of key shortcuts to use conveniently 3. View photo or picture for png/jpg/ia/psd… Shortcut Key: Space : Next Screen Shift + Space : Pre Screen Cmd + "-" : Scale Down Cmd + "+" : Scale Up Cmd + "0" : Origin Size Cmd + Up : Scroll to Top Cmd + Down : Scroll to Bottom Cmd + Left : Move to Pre Picture Cmd + Right : Move to Next Picture (Make sure pre/next file under 'Downloads' directory or subdirectory) Number 0 - 8 : Scroll to No. 1 to 9 Screen