GIMP, the popular open-source image manipulation program, includes a number of built-in lighting and shadow effects. One of these, called "Supernova," creates radiating beams of photo-realistic light ...

Launch GIMP and select Windows > Dockable Dialogs > Gradients. A Gradients window will show up in the upper right corner. The window lists all the gradients that come pre-installed with GIMP. To ...