It would be helpful if you could describe how you wanted to use the image/file. You can take a screenshot that will be saved as a .png, with a name Reader_date_time.
When you take a successful screenshot, you are given where the snapshot png is stored and offered an option to set it as the screensaver. (The option won't work if the OS on your device manages the screensaver function, like Android does on my note 2.)
Luck;
Ken
|