Read PNG image data into NumPy array using Python

Last update on September 01 2025 12:42:12 (UTC/GMT +8 hours)

18. Image File Read (PNG)

Write a NumPy program that read image data from a PNG file into a NumPy array using an image processing library like PIL or opencv.

Read PNG image data into NumPy array using Python

Sample Solution:

Python Code:

from PIL import Image
import numpy as np

# Define the path to the PNG file
image_path = 'image.png'

# Open the image file using PIL
image = Image.open(image_path)

# Convert the image to a NumPy array
image_array = np.array(image)

# Print the shape of the image array to verify
print('Image array shape:', image_array.shape)

# Display the image array (optional, requires matplotlib)
import matplotlib.pyplot as plt
plt.imshow(image_array)
plt.show()

Output:

Image array shape: (170, 132, 3)

Explanation:

Import Libraries:

Imported Image from the PIL library for image processing.
Imported numpy as np for handling arrays.

Define Image Path:

Set the path to the PNG file as image_path.

Open Image File:

Used Image.open to open the image file specified by image_path.

Convert Image to NumPy Array:

Converted the image object to a NumPy array using np.array.

Print Image Array Shape:

Printed the shape of the NumPy array to verify the conversion.

Display Image Array:

Optionally displayed the image using matplotlib.pyplot to visualize the array data.

For more Practice: Solve these Related Problems:

Write a Numpy program to read image data from a PNG file into an array using an image library and then apply a grayscale transformation.
Write a Numpy program to import a PNG image as a NumPy array and then extract specific color channels for analysis.
Write a Numpy program to load a PNG image into an array and then perform edge detection using convolution filters.
Write a Numpy program to read an image file, convert it to a NumPy array, and then resize it using array slicing and interpolation.

Go to:

PREV : MATLAB .mat File Round-trip.
NEXT : Save Array as Image File.

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