Python 你能把颜色贴图的顺序颠倒过来吗？

我有一张branca彩色地图，可以翻一下订单吗

e、 g。 这：

为此：

代码：

• cm.linear

  是

  LinearColormap

  实例的集合

• LinearColormap

  具有一个颜色列表

  colors

  ，以及用于将值线性映射到颜色的最小值

  vmin

  和最大值

  vmax

• LinearColormap

  初始值设定项将颜色列表以及最小值和最大值作为参数

  def reversed_colormap(existing):
      return cm.LinearColormap(
          colors=list(reversed(existing.colors)),
          vmin=existing.vmin, vmax=existing.vmax
      )
  

---

因此，您可以在现有实例的基础上创建一个新的

LinearColormap

实例，方法是将反转的颜色传递给颜色列表，并使用相同的最小值和最大值

def reversed_colormap(existing):
    return cm.LinearColormap(
        colors=list(reversed(existing.colors)),
        vmin=existing.vmin, vmax=existing.vmax
    )

例如：

RdBu_11_reverse = reversed_colormap(cm.linear.RdBu_11)

试试这个：

import branca.colormap as cm

den_colormap = cm.linear.RdBu_11.colors
print('Original : \n', den_colormap)

den_colormap.reverse()
print('reversed : \n', den_colormap)

out = cm.LinearColormap(colors=den_colormap)
print('out : \n', out.colors)

输出：

Original : 
 [(0.403921568627451, 0.0, 0.12156862745098039, 1.0), (0.6980392156862745, 0.09411764705882353, 0.16862745098039217, 1.0), (0.8392156862745098, 0.3764705882352941, 0.30196078431372547, 1.0), (0.9568627450980393, 0.6470588235294118, 0.5098039215686274, 1.0), (0.9921568627450981, 0.8588235294117647, 0.7803921568627451, 1.0), (0.9686274509803922, 0.9686274509803922, 0.9686274509803922, 1.0), (0.8196078431372549, 0.8980392156862745, 0.9411764705882353, 1.0), (0.5725490196078431, 0.7725490196078432, 0.8705882352941177, 1.0), (0.2627450980392157, 0.5764705882352941, 0.7647058823529411, 1.0), (0.12941176470588237, 0.4, 0.6745098039215687, 1.0), (0.0196078431372549, 0.18823529411764706, 0.3803921568627451, 1.0)]

reversed : 
 [(0.0196078431372549, 0.18823529411764706, 0.3803921568627451, 1.0), (0.12941176470588237, 0.4, 0.6745098039215687, 1.0), (0.2627450980392157, 0.5764705882352941, 0.7647058823529411, 1.0), (0.5725490196078431, 0.7725490196078432, 0.8705882352941177, 1.0), (0.8196078431372549, 0.8980392156862745, 0.9411764705882353, 1.0), (0.9686274509803922, 0.9686274509803922, 0.9686274509803922, 1.0), (0.9921568627450981, 0.8588235294117647, 0.7803921568627451, 1.0), (0.9568627450980393, 0.6470588235294118, 0.5098039215686274, 1.0), (0.8392156862745098, 0.3764705882352941, 0.30196078431372547, 1.0), (0.6980392156862745, 0.09411764705882353, 0.16862745098039217, 1.0), (0.403921568627451, 0.0, 0.12156862745098039, 1.0)]

out : 
 [(0.0196078431372549, 0.18823529411764706, 0.3803921568627451, 1.0), (0.12941176470588237, 0.4, 0.6745098039215687, 1.0), (0.2627450980392157, 0.5764705882352941, 0.7647058823529411, 1.0), (0.5725490196078431, 0.7725490196078432, 0.8705882352941177, 1.0), (0.8196078431372549, 0.8980392156862745, 0.9411764705882353, 1.0), (0.9686274509803922, 0.9686274509803922, 0.9686274509803922, 1.0), (0.9921568627450981, 0.8588235294117647, 0.7803921568627451, 1.0), (0.9568627450980393, 0.6470588235294118, 0.5098039215686274, 1.0), (0.8392156862745098, 0.3764705882352941, 0.30196078431372547, 1.0), (0.6980392156862745, 0.09411764705882353, 0.16862745098039217, 1.0), (0.403921568627451, 0.0, 0.12156862745098039, 1.0)]

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这似乎对我不起作用。选项1失败，因为反向列表没有长度，而选项2生成的地图只有红色。好的，谢谢。然后您需要将

reversed

返回的迭代器显式转换为列表。我不知道为什么选项2不起作用。