How to Create a Log-scale Colorbar with Evenly Spaced Ticks at Powers of 2 in GMT/PyGMT?

Q&A
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Hi everyone,

I’m trying to create a linear colorbar in GMT or PyGMT with tick marks at powers of 2 (e.g., 0, 2, 4, 8, 16, 32, 64, 128). I’d like the tick marks to appear evenly spaced along the colorbar, even though the values correspond to a powers-of-2 progression. Additionally, I need the colors to transition linearly (see the attached figure for reference).

Does anyone know how to achieve this? I’d appreciate any suggestions or examples. Thank you!

colorbar_strain_rates
colorbar_strain_rates1776×1442 267 KB

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The solution would be to create a linear colorbar and add custom annotations and tick marks to it (if I understood your query correctly).

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Isn’t it possible to create a discrete colormap from an array?
Like associating bins to color-range ?