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https://github.com/1313e/cmasher

Scientific colormaps for making accessible, informative and 'cmashing' plots
https://github.com/1313e/cmasher

colormaps data-visualization matplotlib plotting python utility-functions

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Scientific colormaps for making accessible, informative and 'cmashing' plots

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README 

        
|PyPI| |conda-forge| |Python| |GitHub| |JOSS|



*CMasher*: Scientific colormaps for making accessible, informative and *cmashing* plots

=======================================================================================

The *CMasher* package provides a collection of scientific colormaps and utility functions to be used by different *Python* packages and projects, mainly in combination with `matplotlib`_, showcased in the `online documentation`_ (where I also describe how to use the colormaps in other languages and applications).

The colormaps in *CMasher* are all designed to be perceptually uniform sequential using the `viscm`_ package; most of them are color-vision deficiency friendly; and they cover a wide range of different color combinations to accommodate for most applications.

It offers several alternatives to commonly used colormaps, like *chroma* and *rainforest* for *jet*; *sunburst* for *hot*; *neutral* for *binary*; and *fusion* and *redshift* for *coolwarm*.

If you cannot find your ideal colormap, then please open an `issue`_, provide the colors and/or style you want, and I will try to create one to your liking!

Let's get rid of all bad colormaps in the world together!



*If you use CMasher for your work, then please star the repo, such that I can keep track of how many users it has and more easily raise awareness of bad colormaps.*

*Additionally, if you use CMasher as part of your workflow in a scientific publication, please consider citing the CMasher paper* (*BibTeX:* ``cmr.get_bibtex``).



.. _issue: https://github.com/1313e/CMasher/issues

.. _online documentation: https://cmasher.readthedocs.io

.. _matplotlib: https://github.com/matplotlib/matplotlib

.. _viscm: https://github.com/matplotlib/viscm



Colormap overview

-----------------

Below is an overview of all the colormaps that are currently in *CMasher* (made with the ``cmr.create_cmap_overview()`` function).

For more information, see the `online documentation`_.



.. image:: https://github.com/1313e/CMasher/raw/master/static/cmap_overview.png

    :width: 100%

    :align: center

    :target: https://cmasher.readthedocs.io

    :alt: CMasher Colormap Overview



In the figure, one can see this wide range of color combinations that *CMasher* has to offer, as I wanted to make sure that *CMasher* has a colormap for everyone.

Because of this, *CMasher*'s sequential colormaps range from single major color maps like *amber*; *ember*; *flamingo*; *freeze*; *gothic*; and *jungle*, to colormaps with high perceptual ranges like *apple*; *chroma*; *torch*; *neon*; and *rainforest*.

The diverging colormaps in *CMasher* have a similar variety, but more importantly, several of them have a black center instead of a white center, like *iceburn*; *redshift*; *watermelon*; and *wildfire*.

Black centered diverging colormaps are quite rare as most researchers are used to white centered ones, even though a black centered diverging colormap can be rather useful in certain cases, like plotting a radial velocity map (the further away from the common center, the higher the velocity in either direction, and thus the corresponding color should be brighter).



Installation & Use

==================

How to install

--------------

*CMasher* can be easily installed directly from `PyPI`_ with::



    $ pip install cmasher



or from `conda-forge`_ with::



    $ conda install -c conda-forge cmasher  # If conda-forge is not set up as a channel

    $ conda install cmasher                 # If conda-forge is set up as a channel



If required, one can also clone the `repository`_ and install *CMasher* manually::



    $ git clone https://github.com/1313e/CMasher

    $ cd CMasher

    $ pip install .



*CMasher* can now be imported as a package with ``import cmasher as cmr``.



Besides Python, *CMasher*'s colormaps can also be accessed in various other languages and applications.

A list of all currently known languages and applications that support *CMasher* can be found in the online documentation `here `_.



.. _repository: https://github.com/1313e/CMasher

.. _PyPI: https://pypi.org/project/CMasher

.. _conda-forge: https://anaconda.org/conda-forge/CMasher



Example use

-----------

The colormaps shown above can be accessed by simply importing *CMasher*.

This makes them available in the ``cmasher`` module, in addition to registering them in *matplotlib*'s ``cm`` module (with added ``'cmr.'`` prefix to avoid name clashes).

So, for example, if one were to use the *rainforest* colormap, this could be done with:



.. code:: python



    # Import CMasher to register colormaps

    import cmasher as cmr



    # Import packages for plotting

    import matplotlib as mpl

    import matplotlib.pyplot as plt

    import numpy as np



    # Access rainforest colormap through CMasher or MPL

    cmap = cmr.rainforest                   # CMasher

    cmap = mpl.colormaps['cmr.rainforest']  # MPL



    # Generate some data to plot

    x = np.random.rand(100)

    y = np.random.rand(100)

    z = x**2+y**2



    # Make scatter plot of data with colormap

    plt.scatter(x, y, c=z, cmap=cmap, s=300)

    plt.show()



For other use-cases, including an overview of *CMasher*'s utility functions and how to use *CMasher* in other programming languages and applications, see the `online documentation`_.



.. |PyPI| image:: https://img.shields.io/pypi/v/CMasher.svg?logo=pypi&logoColor=white&label=PyPI

    :target: https://pypi.python.org/pypi/CMasher

    :alt: PyPI - Latest Release

.. |Python| image:: https://img.shields.io/pypi/pyversions/CMasher?logo=python&logoColor=white&label=Python

    :target: https://pypi.python.org/pypi/CMasher

    :alt: PyPI - Python Versions

.. |GitHub| image:: https://img.shields.io/github/actions/workflow/status/1313e/CMasher/.github/workflows/test.yml?branch=dev

    :target: https://github.com/1313e/CMasher/actions

    :alt: GitHub Actions - Build Status



.. |ReadTheDocs| image:: https://img.shields.io/readthedocs/cmasher/latest.svg?logo=read%20the%20docs&logoColor=white&label=Docs

    :target: https://cmasher.readthedocs.io

    :alt: ReadTheDocs - Build Status

.. |JOSS| image:: https://img.shields.io/badge/JOSS-paper-brightgreen

   :target: https://doi.org/10.21105/joss.02004

   :alt: JOSS - Submission Status

.. |conda-forge| image:: https://img.shields.io/conda/vn/conda-forge/cmasher.svg?logo=conda-forge&logoColor=white

    :target: https://anaconda.org/conda-forge/cmasher

    :alt: Conda-Forge - Latest Release