void unref(void *x) {
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.，推荐阅读旺商聊官方下载获取更多信息
我在北京同仁医院的病床上度过了一段难挨的时光。那时，经过三期的化疗，身上的淋巴瘤已然全部消失，但药物的副作用也明显地显现出来：厌食、失去味觉、便秘、失眠。何况，后面还有四期、五期、六期、七期，最终可能要八期的化疗等着我。可想而知，我的心绪是何等沮丧。“掐着指头数日子”“天花板像一页读腻了的书”，这是臧克家先生住院时写下的诗句，如今的我，每天都不得不默诵几遍。。同城约会对此有专业解读
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