7月1日，甘肃天水麦积区褐石培心幼儿园因违规使用添加剂，导致上百名幼儿血铅异常甚至中毒的事件引发全国关注。官方通报称，事件原因是幼儿园提供的三色枣发糕、玉米肠卷等食品中的添加剂超标。期间，因天水当地检测结果与幼儿在西安、上海等地异地就医检测结果差异悬殊、天水过往曾发生同类铅中毒事件等因素，引发争议与疑虑。
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Due to this more measured approach, error-diffusion dithering is even better at preserving details and can produce a more organic looking final image. However, the algorithm itself is inherently serial and not easily parallelised. Additionally, the propagation of error can cause small discrepancies in one part of the image to cascade into other distant areas. This is very obvious during animation, where pixels will appear to jitter between frames. It also makes files harder to compress.
self._init_table()