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.
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Mark Barnfield, commercial director at Severn Trent Green Power, said the resulting gas was cleaned and either "injected into the gas grid" or converted to electricity.
Additional reporting by Hosu Lee and Leehyun Choi in Seoul