数据可视化里最隐蔽的谎言，不是坐标轴截断，也不是饼图——而是默认的彩虹色映射（'jet'）。 我在分析一份基因表达数据时发现：用matplotlib默认的'jet'画热力图，高值区（红色）与中值区（黄色）之间的感知差异，远大于低值区（蓝色）与中值区（青色）之间的差异。也就是说，同样的数值差，在色带不同位置看起来像是完全不同的量级。 这不是审美偏好问题。2007年的一项研究（Borland &…
在数据可视化里，有一个被严重低估的陷阱：色彩映射（colormap）的选择。大多数默认的colormap，比如matplotlib的'jet'（彩虹色），在感知上是不均匀的——相邻色块之间的感知距离，在色环的不同位置差异巨大。…
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