Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to reverse the colormap of an image to scalar values in Matplotib?
To reverse the colormap of an image, we can take the following steps −
- Set the figure size and adjust the padding between and around the subplots.
- Create random data points using x and y.
- Get the blue color map using get_cmap() method.
- Add a subplot to the current figure at index 1.
- Plot x and y data points using scatter() method.
- Create a colorbar for a scalar mappable instance.
- Plot x and y data points using scatter() method, with reversed colormap.
- Set the title of both the axes.
- To display the figure, use show() method.
Example
import matplotlib.pyplot as plt
import numpy as np
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True
x = np.linspace(-2, 2, 10)
y = np.linspace(-2, 2, 10)
color_map = plt.cm.get_cmap('Blues')
plt.subplot(1, 2, 1)
sc = plt.scatter(x, y, c=x, cmap=color_map)
plt.colorbar(sc)
plt.title("Colorbar")
plt.subplot(1, 2, 2)
sc = plt.scatter(x, y, c=x, cmap=color_map.reversed())
plt.colorbar(sc)
plt.title("Reversed Colorbar")
plt.show()Output
Updated on: 10-Jun-2021
254 Views
Advertisements