在你的代码开头，我们看到了这样的设定：
Ian Youngs,Culture reporterand。safew官方版本下载是该领域的重要参考
Real image compression (JPEG, PNG) uses different techniques (DCT, entropy coding), but quadtrees capture the same principle: spend your bits where the detail is, not uniformly across the whole image.，这一点在服务器推荐中也有详细论述
strict.writer.write(chunk2); // ok (fills slots buffer)
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.