I need a photo to drastically dim or scatter light so it won't be visible or barely visible when viewed from an angle.
I had read that a lenticular lens film would do the trick but it appears to have no effect other than introducing rainbow fringes. But maybe the lenses are too small.
There are privacy filters for monitors but only start dimming after +-30 degrees from the front and dim anything behind them by about 50%. The angles are too forgiving for my use for the brightness loss they introduce.
Any other options or what am I doing wrong?