What did you do?

Resizing an RGBA image with Image.resize and nearest neighbor interpolation.

What did you expect to happen?

Image resized to given size, no new RGB values introduced.

What actually happened?

New RGB values introduced.

What are your OS, Python and Pillow versions?

• OS: Linux
• Python: 3.8.6
• Pillow: 6.2.1

Python Example

import numpy as np
from PIL import Image

image = np.asarray([[[1, 1, 0, 128]], [[2, 2, 0, 64]]], dtype=np.uint8)

print("Input")
print(image)
print("")

image = Image.fromarray(image)
image = image.resize((1, 1), Image.NEAREST)
image = np.asarray(image)

print("Output")
print(image)

Input
[[[  1   1   0 128]]
 [[  2   2   0  64]]]

Output
[[[ 3  3  0 64]]]