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A colormap tool

Project description

This is a little tool for analyzing colormaps and creating new colormaps.

Code and bug tracker:


Nathaniel J. Smith <> and Stéfan van der Walt <>

  • Python 3.9+

  • colorspacious 1.1+

  • Matplotlib 3.5+

  • NumPy 1.22+

  • SciPy 1.8+

  • one of PyQt6, PySide6


MIT, see LICENSE for details.


This is a GUI application, and requires Qt Python bindings. They can be provided by PyQt (GPL) or PySide (LGPL):

$ pip install viscm[PySide]


$ pip install viscm[PyQt]


$ viscm view jet
$ viscm edit

There is some information available about how to interpret the resulting visualizations and use the editor tool on this website.

Reproducing viridis

Load viridis AKA using:

viscm --uniform-space buggy-CAM02-UCS -m Bezier edit /tmp/

Note that there was a small bug in the assumed sRGB viewing conditions while designing viridis. It does not affect the outcome by much. Also see viscm --help.

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