[Bug]: Pillow 11.3 raises a deprecation warning when using TkAgg #30280

Bug summary

The 'mode' parameter from Image.fromarray has been deprecated, which is used in matplotlib to plot figures using the tkinter backend.

Code for reproduction

# python -Wd
import matplotlib
from matplotlib import pyplot
matplotlib.use("tkagg")
pyplot.subplots()

Actual outcome

DeprecationWarning: 'mode' parameter is deprecated and will be removed in Pillow 13 (2026-10-15)

Expected outcome

No deprecation warning

Additional information

No response

Operating system

Ubuntu (this bug is also present on Windows)

Matplotlib Version

3.10.3 (pillow==11.3.0)

Matplotlib Backend

TkAgg

Python version

Python 3.12.4

Jupyter version

No response

Installation

None