I use Adobe Photoshop 5.5 to create photoshop images (all I can afford..lol) as an extension of my creative process, challenging and fun while paintings in progress dry. I've taken photographs as painting references for years and my morgue collection consists of photos, vintage periodical's, and photographs. When using another photograher's copyrighted image I credit their image and provide a link to their website or wikipedia biography so you can see more of their outstanding work.