Why Is My Matplotlib Savefig Output Blank?

Matplotlib: Resolving Blank Output from Savefig

Encountering blank images when attempting to save plots with matplotlib can be frustrating. Here are some insightful observations and potential solutions:

1. Inspecting the Code

Upon examining the provided code, it is evident that savefig() is invoked after plt.show(). However, this sequence may disrupt the saving process.

2. Addressing T0's Influence

The code contains conditional logic based on whether T0 is defined. Determine the impact of this condition. If T0 is not None, investigate the consequences and ensure that the subplot indices are appropriately adjusted.

3. Saving the Correct Figure

After executing plt.show(), a new figure is generated. To avoid saving the blank new figure, there are two options:

• Option 1: Instruct savefig() to operate on the desired figure before displaying it.

plt.savefig('tessstttyyy.png', dpi=100)
plt.show()
plt.draw()

• Option 2: Retrieve the current figure using plt.gcf() and save it later.

fig1 = plt.gcf()
plt.show()
plt.draw()
fig1.savefig('tessstttyyy.png', dpi=100)

4. Potential Pitfalls

Ensure that the images are rendered before saving, either by calling plt.draw() or plt.show(). Additionally, check that the image format specified in the savefig() method (e.g., '.png') is correct.

5. Handling Output Blankness

If the specified savefig() call results in a blank image, verify that the code is executed after the plot has been rendered. As previously mentioned, invoking plt.show() creates a new figure that must be saved separately if needed.

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