从python中的colorlover中的色标中获取单个颜色

问题描述

我有一个类似于此帖子，但用于其他库 colorlover .我想创建一个色标，然后从该色标中提取特定颜色.

I have a question similar to this post, but it's for a different library, colorlover. I would like to create a colorscale and then pull a specific color from that scale.

例如，

    import colorlover as cl
    color_scale = cl.scales['3']['div']['Spectral']
    color_scale
    >['rgb(252,141,89)', 'rgb(255,255,191)', 'rgb(153,213,148)']

然后，我想在比例尺的75％处找到颜色

Then, I'd like to find the color at 75% of the scale with something similar to

color_scale(0.75)

理想情况下将返回该颜色的rgb值.

which would ideally return the rgb value for that color.

我也愿意使用其他任何将返回rgb值或与plotly兼容的颜色格式的软件包.

I'm also open to using any other package that will return a rgb value or a color format that is compatible with plotly.

推荐答案

要从色标中选择一种颜色并以色图方式使用，可以使用 matplotlib颜色图来选择一种颜色，然后将该颜色转换为需要的rgb格式.

To select a single color from a colorscale and use it in plotly, you can use matplotlib colormap to select a color, then convert the color to the rgb format that plotly requires.

例如，

import matplotlib

#Generate a color scale
cmap = matplotlib.cm.get_cmap('Spectral')

#Select the color 75% of the way through the colorscale   
rgba = cmap(0.75)

#This produces an rgb format between 0 and 1
print(rgba) # (0.5273356401384084, 0.8106113033448674, 0.6452133794694349, 1.0)

(如果出现错误，则模块'matplotlib'没有属性'cm'，请尝试以下方法:)

(If that gives an error, module 'matplotlib' has no attribute 'cm', try this instead:)

import matplotlib.pyplot as plt
cmap = plt.cm.get_cmap('Spectral')
rgba = cmap(0.75)
print(rgba) # (0.5273356401384084, 0.8106113033448674, 0.6452133794694349, 1.0)

我们现在具有RGB颜色，但是对于绘图来说格式错误.要求格式为'rgb(254，254，190)'.这可以通过将元组中的上述元素乘以255，然后转换为字符串来实现.

We have an RGB color now, but it's in the wrong format for plotly. Plotly requires the format 'rgb(254, 254, 190)'. This can be accomplished by multiplying the above elements in the tuple by 255 and then converting to a string.

rgba = tuple(int((255*x)) for x in rgba[0:3])
rgba = 'rgb'+str(line_color)
print(rgba) #'rgb(134, 206, 165)'

rgba 现在是一个字符串，可用于在绘图中选择颜色.

rgba is now a string that can be used to select a color in plotly.

这篇关于从python中的colorlover中的色标中获取单个颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！