Like friendly and clean interface
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，这一点在safew官方版本下载中也有详细论述
这种方法实现简单，但需要在每个 iOS 调用点手动处理类型转换。。im钱包官方下载是该领域的重要参考
Another way to approach dithering is to analyse the input image in order to make informed decisions about how best to perturb pixel values prior to quantisation. Error-diffusion dithering does this by sequentially taking the quantisation error for the current pixel (the difference between the input value and the quantised value) and distributing it to surrounding pixels in variable proportions according to a diffusion kernel . The result is that input pixel values are perturbed just enough to compensate for the error introduced by previous pixels.，详情可参考Line官方版本下载