niivue / Py2NiiVueColormaps

Convert popular Python colormaps for use in NiiVue

Py2NiiVueColormaps

NiiVue comes with many built-in colormaps, which you can explore in this live demo.

The live demo custom button also shows how you can define new colormaps:

let cmap = {
  R: [0, 255, 22, 127],
  G: [0, 20, 192, 187],
  B: [0, 152, 80, 255],
  A: [0, 255, 255, 255],
  I: [0, 22, 222, 255],
};
let key = "Custom";
nv1.addColormap(key, cmap);
nv1.volumes[0].colormap = key;

However, matplotlib provides many of its own colormaps. The purpose of this repository is to convert many of the matplotlib _cm.py colormaps to NiiVue's JSON format. To re-build the colormaps in the lut folder you can run:

git clone https://github.com/niivue/Py2NiiVueColormaps
cd Py2NiiVueColormaps
python lut2niivue.py

Note that _cm.py uses several different methods to colormaps, and this repository only currently converts some of these (it generates a report of the converted and skipped colormaps).

Note that the file _cm.py is from matplotlib and retains that permissive license.