Changes in the wallpaper specification of iOS 10.2
iOS 10 was darkening all the wallpapers. This has been abolished in iOS 10.2.
Left: iOS10-10.1 Right: iOS 10.2
However, in middle-density wallpapers, high-contrast wallpapers, etc., the characters turn white, in which case it gets dark. When the wallpaper gets dark, the upper part of the screen becomes dim. This is the same as the Lock Screen of iOS 10-10.1. In other words, it was restored to the iOS 9 Home Screen.
Strictly speaking, the boundary between whether the wallpaper gets dark or not is about the same as iOS 8.3-8.4 (difference with iOS 9 is very small). Wallpaper darkened at the timing of iOS 9 may brighten again at 10.2.
The color of the folder is slightly brighter than iOS 9.3 (therefore the 9.3 wallpaper on this site does not necessarily revive).
The effect of small wallpaper was further fragmented between different devices compared to iOS 10-10.1.
There is an addition to the default wallpaper for iPhone 7.