Take a moment and read the article, “How to Use Your iPhone as a Quick and Easy Negative Viewer” and download a FREE phone app below to have the option to view and save your negative in positive:
ARTICLE
“How to Use Your iPhone as a Quick and Easy Negative Viewer”
http://petapixel.com/2012/10/23/how-to-use-your-iphone-as-a-quick-and-easy-negative-viewer/
APPS
Negative Me Free (iphone)
https://itunes.apple.com/us/app/negative-me-free-best-image/id488565628?mt=8
Easy Image Negative (android)
https://play.google.com/store/apps/details?id=com.hunterdavis.easyimagenegative&hl=en