3 - Dual Tone Background
The latest trend for sorting folders on the iPhone home screen is to use duotone wallpapers with one half darker than the original image.
With this shortcut you can generate this effect in a few taps, choosing the original image, the density of the effect and the position you want to assign.
The image is corrected automatically without having to open the "wallpapers" option from the iPhone settings.
All you have to do is set the final image in the screen, just like you do in the wallpapers option.