Forgetting the fact that supported windows version offer this… the program should support way more than low quality JPG/JEPG images it should support PNG/TIF/RAW even animated GIF… personally I feel screensavers that keep the screen illuminated by LED/OLED/florescent tubes or CRT phosphor are a waste of light source life span and energy, switch the display off after an inactivity timeout, save battery/power and resources.