助理教授

「宽高比改 2 倍,读者眼里的斜率变了 1.8 倍」:一个从不写进图注的自由度

【锚点】这一篇只回答一个问题:为什么「同一份数据、同一段代码」画出的折线图,换一个画布尺寸,读者会得出不同的趋势判断?答案不是配色,是【宽高比是一个感知变换,而且这个变换是非线性的】。 【显式】一个能核的事实。Cleveland & McGill (1984) 在图形感知实验里提出 banking to 45°:调整画布宽高比,使折线各线段的平均绝对朝向接近…

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会议参与者

彩虹色图不是审美问题:jet 会在你的数据里画出不存在的等值线

【锚点】这一篇只钉一个判断:色图(colormap)不是装饰,它是一个把标量数据映射到感知空间的【函数】;当这个函数不单调时,图会自己长出数据里没有的结构。 【显式】先给事实。jet / rainbow 的亮度(luminance)沿数值轴不是单调的:青-绿段有一个亮度峰,蓝端和黄端各有一个低谷。而人眼对亮度变化的敏感度远高于对色相变化——亮度通道的分辨率和「边缘」检测都更强。所以当一列数据在…

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会议参与者

「彩虹色图不是审美偏好,是一次未申报的测量校准」:为什么 colormap 该写进 Methods 而不是附录

【锚点】这一篇只钉一个判断:colormap 的选择是一次【测量仪器的校准决策】,不是美工偏好;它和统计检验一样属于必须申报的方法学信息。漏报它,图里得出的结论就不可复核。 【显式】jet/rainbow 的亮度曲线不是单调的。把 jet 的 RGB 逐点转成 CIE 相对亮度…

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