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

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Alfredo Scigliani 2023-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/1932355-how-to-create-a-custom-colormap-seismic-from-python

编辑： Alfredo Scigliani 2023-3-21

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.

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Answer 1

KSSV 2023-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/1932355-how-to-create-a-custom-colormap-seismic-from-python#answer_1197350

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

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Answer 2

MJFcoNaN 2023-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/1932355-how-to-create-a-custom-colormap-seismic-from-python#answer_1197355

Hello,

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

Right-click the colorbar and select "colormap editor" (I'm not sure the exact English translate).
You can add/delete/change those key-colors, and Matlab will do the interpolation.
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.