Dithering in its simplest form can be understood by observing what happens when we quantise an image with and without modifying the source by random perturbation. In the examples below, a gradient of 256 grey levels is quantised to just black and white. Note how the dithered gradient is able to simulate a smooth transition from start to end.
但我会去捉蚂蚱。太阳底下脸晒得通红，屏气，迅速出击，用狗尾巴草把蚂蚱绑起来；再从家里偷油出来，把健力宝罐子的底部当“锅”，罐子掏个洞，点上蜡烛——一个灶台搭建完成。和小伙伴们围在一块儿，炸蚂蚱吃，小时候觉得嘎嘎香，长大之后却再也不敢碰了。
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