If you are using xscreensaver, but your pictures in a directory. Then, in the xscreensaver-demo "Advanced" Tab, go to the "Image Manipulation" section (top left), and, next to the "Choose Random Images" checkbox, enter the name of that directory in the dialog box. Then, when you select the GLSlideshow (or other image manipulation screensaver), the images in that directory will be displayed.
If you are using a different screensaver, uninstall it and install xscreensaver.
Last edited by frankbell; 06-29-2014 at 09:40 PM.