How to Make a Matplotlib Colorbar Match the Height of Your Graph?

How to Adjust Colorbar Size to Match Matplotlib Graph

When creating imshow graphs, it can be challenging to align the colorbar to the same height as the graph without resorting to external tools like Photoshop. This article provides a solution to ensure that the colorbar and graph have consistent heights.

The key to achieving this adjustment lies in the values assigned to the fraction and pad parameters of the plt.colorbar() function. The optimal combination of these values has been found to be:

plt.colorbar(im, fraction=0.046, pad=0.04)

With these values, the colorbar scales automatically to match the plot, regardless of the display size. This eliminates the need to readjust the colorbar size manually or use additional post-processing tools.

Moreover, this method does not require axis sharing, which could potentially distort the squareness of the plot. By applying these settings, users can ensure that their Matplotlib imshow graphs have a visually balanced colorbar that complements the graph size precisely.

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