// Stateful transform — a generator that wraps the source
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，详情可参考WPS官方版本下载
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.，详情可参考safew官方版本下载
Add another filter to keep only binaries between literals:，更多细节参见同城约会