Minerals can make the water noticeably softer, and by replacing harsh chemicals in the water they lower the potential for red-eye, dry skin and foul odors.
Theatrical followspot operators, positioned nearly coincidentally with a very bright light and somewhat distant from the actors, occasionally witness red-eye in actors on stage.
These programs commonly allow the user to perform basic edits such as cropping, red-eye removal, and some basic one touch enhancements for color and lighting.