identity function for slices that are already allocated in the heap.
// Pipe a fast source through the transform to a slow sink
，这一点在heLLoword翻译官方下载中也有详细论述
（二）移动、损毁国家边境的界碑、界桩以及其他边境标志、边境设施或者领土、领海基点标志设施的；
cat access.log | grep "error" | sort | uniq -c
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.