[Solved] Why does this code not produce a transparent background in the saved image?import matplotlib.pyplot as plt fig, ax = plt.subplots(facecolor='white') ax.plot([1, 2, 3]) fig.savefig('output.... | Matplotlib

Matplotlib - Export and Publication Quality

Why does this code not produce a transparent background in the saved image?

import matplotlib.pyplot as plt
fig, ax = plt.subplots(facecolor='white')
ax.plot([1, 2, 3])
fig.savefig('output.png', transparent=True)

AThe axes background color overrides the transparent parameter.

BThe figure facecolor parameter is ignored when transparent=True is set.

CThe transparent parameter only works with plt.plot(), not fig.savefig().

DThe transparent parameter must be set to False to work.

Step-by-Step Solution

Solution:

Step 1: Understand figure and axes backgrounds
The default axes background color is white, which remains opaque even with transparent=True. Setting facecolor='white' on plt.subplots() sets the figure background color, which is made transparent by transparent=True.
Step 2: Effect of axes background on transparency
Even if transparent=True is set, the axes background remains white, so the saved image is not fully transparent.
Final Answer:
The axes background color overrides the transparent parameter. -> Option A
Quick Check:
Axes background color can block transparency [OK]

Quick Trick: Set axes facecolor to 'none' for full transparency [OK]

Common Mistakes:

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Why does this code not produce a transparent background in the saved image?