How to create a custom colormap ("seismic" from python)

I have read the colormap helpdocs but I am in need of a bit of help. I am not so familiar with RGB codes for colors, but I am trying to create a colormap like the one attached. It goes from red to white in the middle and then from white to blue towards the bottom end. How can I achieve something like this?

This specific colormap is called "seismic" in python.

Answer 1

[KSSV]

Refer this: https://in.mathworks.com/matlabcentral/fileexchange/45208-colorbrewer-attractive-and-distinctive-colormaps

https://in.mathworks.com/matlabcentral/fileexchange/57773-cmocean-perceptually-uniform-colormaps

Answer 2

[MJFcoNaN]

Hello,

The easiest way may be creating manually in "colormap editor" and then you can save it.

1. Right-click the colorbar and select "colormap editor" (I'm not sure the exact English translate).
2. You can add/delete/change those key-colors, and Matlab will do the interpolation.
3. You may choose the default "jet" colormap as a template. then delete some unwanted key-colors and add a white key-color in the middle.